CN111012024B

CN111012024B - Personalized containing space and modeling combined backpack and mother backpack and son backpack thereof

Info

Publication number: CN111012024B
Application number: CN201811174658.9A
Authority: CN
Inventors: 陆定邦; 洪婉庭
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-10-09
Filing date: 2018-10-09
Publication date: 2021-10-29
Anticipated expiration: 2038-10-09
Also published as: CN111012024A

Abstract

The invention provides a combined backpack with personalized containing space and modeling and a mother backpack and a son backpack thereof, wherein a first fixing part is connected with a mother backpack, and a plurality of first fixing holes are formed in the first fixing part; the backpack is connected with a second fixing part, a first direction and a second direction are defined on the second fixing part, a plurality of first connecting pieces and a plurality of second connecting pieces are arranged on the second fixing part, the first connecting pieces are arranged in a pairwise opposite mode in the first direction, the second connecting pieces are arranged in a pairwise opposite mode in the second direction, and the first connecting pieces or the second connecting pieces penetrate through the first fixing holes from the outer side face and then are combined with each other on the inner side face. The user can plan the containing space and change the appearance modeling by himself through a plurality of combination modes, and construct the knapsack with the personalized containing space and modeling changed.

Description

Personalized containing space and modeling combined backpack and mother backpack and son backpack thereof

Technical Field

The invention relates to a combined backpack structure which can enlarge the containing space and allow a user to determine the appearance shape by himself.

Background

At present, a common person goes out or works by using a backpack to contain articles to be carried. However, since the storage space of the backpack is fixed, it is difficult to expand the storage space for a large number of articles to be carried. Moreover, the existing backpack has fewer compartments and poor classification, and is easy to mix various different articles in the same containing space, so that inconvenience is caused when articles are searched.

Therefore, there is a new patent No. M546148 "backpack configuration" issued by taiwan in china in 8/1/2017, which discloses: comprises a seat body and one or more than one backpack. Wherein the seat body comprises two shoulder belts and is provided with at least one buckling part; each backpack is provided with at least one connecting element or a buckling part; the connecting elements can be used for connecting to the buckling part of the seat body or another backpack which needs to be connected, so as to achieve the practical purpose of various changes in the using state.

The patent of the prior art is mainly based on that a user can hang a backpack with required size on a seat body at will, so as to meet the optimal requirement of an outgoing object placing space. Or, the backpack is stored in a relatively large backpack before going out, and after shopping amount is increased continuously, the backpack is taken out and hung outside the backpack to enlarge the storage space and increase the storage amount. However, the fixing directions of the attached big and small backpacks are the same, and the longitudinal or transverse fixing directions cannot be selected according to the size of the backpack or the opening position of the zipper, so that the taking of the contents of the big and small backpacks will be influenced if the backpack is fixed in different directions.

There is also a new model M29292945 patent published by taiwan in china, 7/1/2006, which discloses: the bag body is provided with a first accommodating space formed by the upper surface, the bottom surface and the side edges and used for accommodating articles; at least one containing unit or unit accessory which is fixed on the outer side of the upper surface of the bag body in a repeatable sticking way; and the shell is connected to the bottom surface of the bag body and forms a second containing space with the upper surface of the bag body for containing the containing unit. Because the containing units are fixed on the outer side of the upper surface of the bag body in a repeatable sticking mode, the containing units or unit accessories with different sizes can be selected according to the requirements of users, and the objects are contained in a classified mode and are combined, arranged and fixed on the outer side of the upper surface of the bag body, so that the containing space of the backpack is more effectively utilized.

Although the above patent publications utilize the outer side of the upper surface of the bag body to form a magic sticky velvet surface, the containing units can be repeatedly stuck on the velvet surface, and the containing units with different sizes can be fixed in different directions (longitudinal or transverse), so as to achieve the effect of conveniently taking the contents. However, since each storage unit is fixed to the bag body only by adhesion, it is easy to take it off from the night and steal it when the user wears the back, and thus it is not ideal for use.

Disclosure of Invention

The invention aims to: the utility model provides a combination knapsack of individualized storage space and molding and female knapsack and son knapsack thereof solves the above-mentioned technical problem that exists among the prior art.

The invention provides a combined backpack with personalized containing space and modeling, which is provided with a female backpack and comprises a backpack strap surface and an outer edge surface opposite to the backpack strap surface, wherein the outer edge surface is provided with a first fixing part which is provided with an outer side surface and an inner side surface oppositely, and the first fixing part is provided with a plurality of first fixing holes penetrating through the outer side surface and the inner side surface; the backpack is movably fixed on the first fixing part, the backpack is connected with a second fixing part, a first direction and a second direction are defined on the second fixing part, a plurality of first connecting pieces and a plurality of second connecting pieces are arranged on the second fixing part, the first connecting pieces are arranged in pairs in opposite directions along the first direction, the second connecting pieces are arranged in pairs in opposite directions along the second direction, and the first connecting pieces or the second connecting pieces penetrate through the first fixing holes from the outer side surface and are then combined with each other on the inner side surface.

The first direction and the second direction are perpendicular to each other, the first direction represents a transverse direction relative to the second fixing portion, and the second direction represents a longitudinal direction relative to the second fixing portion.

The first containing space is arranged in the female backpack, and the first fixing part is provided with a first zipper for sealing the first containing space.

The position of the inside of the first accommodating space adjacent to the first fixing portion is provided with a covering sheet, and the covering sheet is adhered and fixed on the first fixing portion by virtue of a plurality of adhesive tapes so as to shield the first fixing holes.

The inside of the sub-backpack is provided with a second containing space, and the second fixing part is provided with a second zipper for sealing the second containing space.

The backpack and the second fixing part are separately arranged, so that the backpack or the second fixing part with different shapes, styles, colors, patterns or patterns can be replaced mutually.

The second zipper is provided with four zipper heads so as to pull two of the zipper heads to form an opening position in any direction or angle.

The first connecting piece and the second connecting pieces are respectively set to be separated from the second fixing part.

The second fixing part is provided with a plurality of second fixing holes at positions corresponding to the first fixing holes of the first fixing part, and the first connecting pieces or the second connecting pieces respectively penetrate through the second fixing holes and the first fixing holes and then are mutually bonded and fixed.

The first fixing portion is formed in a plate shape.

The invention also provides a mother backpack, which comprises a backpack surface and an outer edge surface opposite to the backpack surface, wherein the outer edge surface is provided with a first fixing part, the first fixing part is provided with a plurality of first fixing holes which penetrate through the first fixing part, and the first fixing holes are used for a connecting piece to penetrate through so that the connecting piece is fixed on the outer edge surface.

The first fixing hole is provided with a plurality of rope-shaped connecting pieces in a penetrating way.

The elastic clamping force generated between the connecting pieces is utilized to clamp various articles.

The first fixing hole is used for hanging a bulletin board, a viewing board or an advertising signboard by using the connecting piece.

The present invention is also a backpack, which is combined with the mother backpack, and comprises: the second fixing part is movably fixed on the first fixing part of the mother backpack, and a plurality of second fixing holes which penetrate through the second fixing part are arranged at the positions, corresponding to the first fixing holes of the first fixing part, on the second fixing part; and the plurality of connecting pieces respectively penetrate through the second fixing holes and the first fixing holes and then are mutually fixed.

The inside of above-mentioned sub-knapsack is equipped with a second accommodation space, and this second fixed part is equipped with a second zip fastener to supply airtight this second accommodation space, this second zip fastener be the zip fastener structure of four-head, and in wherein on two adjacent zip fastener, be provided with a consolidation component, so that this two adjacent zip fastener can be fixed mutually.

The above technical features have the following advantages:

1. the first connecting piece or the second connecting piece is adhered to the inner side surface of the first fixing part in the first accommodating space, and is not exposed outside, so that the son backpacks cannot be stolen directly by night or a thief through the rear part of the mother backpack to enhance the anti-theft property. And the two zipper heads are provided with sticky buckles or other fixing elements for fixing so as to mutually fix the two adjacent zipper heads, so that the two zipper heads are prevented from being arbitrarily pulled open, and the warning performance of opening from the rear is improved.

2. According to different use requirements, at least more than one sub-backpack can be used, and the first connecting pieces which are arranged in a pairwise opposite mode in the first direction or the second connecting pieces which are arranged in a pairwise opposite mode in the second direction are selected to be fixed on the mother backpack, so that the effects of convenience in use, expansion of storage space, clear classification of articles and the like can be achieved.

3. By adopting the separated design of the sub-backpack and the second fixing part, the sub backpack or the second fixing part with different shapes, styles, colors, patterns or patterns can be mutually replaced, so that different visual aesthetic changes can be generated.

4. The connecting piece can be arranged on the first fixing hole of the first fixing part in a penetrating manner, and visual aesthetics of various changes can be generated by the connecting piece. Or can hold various articles and hang a billboard, a billboard or an advertising signboard to have the functions of advertisement, notice and the like. Or pattern layers with different shapes are fixed on the second fixing part to increase the aesthetic property or the interest.

Drawings

Fig. 1 is an exploded perspective view of a first embodiment of the present invention.

Fig. 2 is a perspective combination view of the first embodiment of the present invention.

Fig. 3 is a combined sectional view of the first embodiment of the present invention.

Fig. 4 is a schematic view illustrating a first connecting member and a second connecting member respectively fixed to a first fixing portion according to a first embodiment of the present invention.

Fig. 5 is a schematic view (i) illustrating the first embodiment of the present invention, which is fixed to the first fixing portion by means of sub-backpacks of different sizes.

Fig. 6 is a schematic view (two) illustrating the first embodiment of the present invention, wherein the backpack with different sizes is fixed on the first fixing portion.

Fig. 7 is a schematic view (iii) illustrating the first embodiment of the present invention being fixed to the first fixing portion by means of sub-packs of different sizes.

Fig. 8 is a schematic view (iv) of the first embodiment of the present invention, which is used to fix the backpack with different sizes to the first fixing portion.

Fig. 9 is a partially exploded perspective view of a second embodiment of the present invention.

Fig. 10 is a partially exploded perspective view of a third embodiment of the present invention.

Fig. 11 is an exploded perspective view of a fourth embodiment of the present invention.

Fig. 12 is a schematic view showing a backpack according to a fourth embodiment of the present invention being fixed to a mother backpack in various directions.

Fig. 13 is a schematic view illustrating a plurality of connecting members passing through the first fixing hole according to the fourth embodiment of the present invention.

Fig. 14 is a schematic view of a fourth embodiment of the present invention gripping an article with a resilient gripping force between the connectors.

FIG. 15 is a schematic view of a fourth embodiment of the present invention showing a billboard hung by a first fixing hole.

FIG. 16 is a schematic view showing a different modeling pattern layer fixed to a second fixing portion of a backpack according to a fourth embodiment of the present invention.

Fig. 17 is a schematic view showing two adjacent sliders of the second slide fastener according to the fourth embodiment of the present invention, which are fixed to each other by fastening tapes.

Description of reference numerals: 1-mother backpack; 11-a first accommodation space; 12-a first fixed part; 121-outer side; 122-medial side; 123-a first fixing hole; 13-a first zipper; 14-a cover sheet; 141-a fastening tape; 18-strap side; 19-outer edge surface; 2. 2A, 2B, 2C, 2D-backpack; 21-a second accommodation space; 22-a second fixed part; 221-a first connector; 222-a second connector; 223-a second fixing hole; 23-a second zipper; 231-a slider; 3-mother backpack; 31 — a first accommodation space; 32-a first fixed part; 323-first fixing hole; 33-a first zipper; 38-strap side; 39-outer edge surface; 4-a backpack; 41-a second accommodation space; 42-a second fixation section; 421-a connector; 423-second fixing hole; 43-a second zipper; 431-zipper head; 432-hook and loop fastener; 5-a connector; 51-an article; 52-a billboard; 53-a pattern layer; x-a first direction; y-second direction.

Detailed Description

Referring to fig. 1 and 2, a first embodiment of the present invention includes: mother's knapsack 1 and son knapsack 2, wherein:

the mother backpack 1 includes a backpack surface 18 and an outer edge surface 19 opposite to the backpack surface 18, a first accommodating space 11 is disposed inside the mother backpack 1, the outer edge surface 19 is connected to a first rigid plate-shaped fixing portion 12, the first fixing portion 12 is respectively provided with an outer side 121 and an inner side 122, and the first fixing portion 12 is provided with a plurality of first fixing holes 123 penetrating through the outer side 121 and the inner side 122. The first fixing portion 12 is provided with a first zipper 13 to be combined with the mother bag 1 to seal the first accommodating space 11. A covering sheet 14 is disposed inside the first accommodating space 11 and adjacent to the first fixing portion 12, the shape and size of the covering sheet 14 are the same as those of the first fixing portion 12, and the covering sheet 14 can be fixed to the first fixing portion 12 by a plurality of fastening tapes 141, so as to cover the first fixing holes 123 of the first fixing portion 12.

A sub-backpack 2 (for convenience of explanation, the label of the sub-backpack of the present embodiment is denoted by 2A) is movably fixed to the first fixing portion 12 of the mother backpack 1. The inside of the sub-backpack 2 is provided with a second accommodating space 21 (as shown in fig. 3), and the sub-backpack 2 is connected to a second fixing portion 22, and the second fixing portion 22 is provided with a second zipper 23 to be combined with the sub-backpack 2 to seal the second accommodating space 21. The second fixing portion 22 defines a first direction X and a second direction Y perpendicular to each other, and the first direction X represents a transverse direction relative to the second fixing portion 22. The second direction Y represents a longitudinal direction relative to the second fixing portion 22. The second fixing portion 22 is provided with a plurality of first connecting members 221 and a plurality of second connecting members 222 which are perpendicular to each other, the first connecting members 221 are arranged in pairs in the first direction X, and the second connecting members 222 are arranged in pairs in the second direction Y. As shown in fig. 4, the first connecting members 221, which are arranged opposite to each other in the first direction X, can be selectively inserted through the first fixing holes 123 of the first fixing portion 12 and then combined with each other to be fixed on the first fixing portion 12 as required. Or alternatively, the second connecting members 222 oppositely arranged in pairs in the second direction Y are passed through the first fixing holes 123 and then combined with each other, so as to be fixed on the first fixing portion 12. The first connecting pieces 221 and the second connecting pieces 222 are fastening tapes that can be fastened to each other.

In use, as shown in fig. 1 and 3, a large volume of articles is loaded in the first accommodation space 11 inside the mother backpack 1. The second containing space 21 in the sub-backpack 2 is used to contain the small-sized articles, and more than two sub-backpacks 2 can be selected according to the articles with different sizes to sort and contain the articles with different sizes. Then, the backpack 2 is selected according to the usage requirement, and the first connecting members 221 disposed pairwise in the first direction X or the second connecting members 222 disposed pairwise in the second direction Y are inserted into the first fixing holes 123 from the outer side 121 of the first fixing portion 12, and then are bonded and fixed to the inner side 122. Finally, the covering sheet 14 is adhered and fixed on the first fixing portion 12 by the fastening tapes 141, so as to shield the first fixing holes 123 on the first fixing portion 12 and keep the appearance of the covering sheet.

As shown in fig. 3 and 4, after the first connecting members 221, which are oppositely arranged in pairs in the first direction X, of the backpack 2A are selected to pass through the first fixing holes 123 one by one from the outer side 121 of the first fixing portion 12, the first connecting members 221 corresponding to each group are mutually bonded and fixed on the inner side 122, so that the backpack 2A can be fixed on the outer side 121 of the first fixing portion 12. The opening position of the backpack 2A is preferably opened toward the first direction X. Or after the second connecting members 222 of the sub-backpack 2A are oppositely arranged in pairs in the second direction Y are selected to pass through the first fixing holes 123 of the first fixing portion 12 one by one, the corresponding second connecting members 222 of each group are adhered to each other and can be fixed on the first fixing portion 12, so that the opening position of the other sub-backpack 2A is optimally opened towards the second direction Y.

Therefore, according to different requirements, as shown in fig. 4, 5, 6, 7 and 8 (for convenience of illustration, the labels of the backpack with different sizes and shapes are labeled as 2A-2D), the

backpack

2, 2A, 2B, 2C, 2D with different sizes are fixed on the first fixing portion 12 by selecting the first connecting members 221 arranged in pairs opposite to each other in the first direction X or the second connecting members 222 arranged in pairs opposite to each other in the second direction Y, so as to achieve the effects of convenience of use, personalized appearance, storage space expansion, and clear classification of articles. Meanwhile, the mutual bonding positions of the first connecting members 221 or the second connecting members 222 are located on the inner side surface 122 of the first fixing portion 12 and hidden in the first accommodating space 11 (see fig. 3), so that they are not exposed to the outside, and therefore it is difficult for a thief or a small thief to steal the

packsacks

2, 2A, 2B, 2C, 2D directly through the back of the mother backpack 1.

The second embodiment of the present invention, as shown in fig. 9, is different from the first embodiment only in that the backpack 2 and the second fixing portion 22 are separated, and the second zipper 23 on the second fixing portion 22 can be a four-head type zipper structure, so that the second zipper 231 can be utilized to open the second zipper 23 in the first direction X or the second direction Y by pulling, so that the second zipper 231 forms an opening position in any direction or angle (see fig. 4). And the second zipper 23 can be pulled to close, so that the second fixing portion 22 can be combined with the backpack 2 to seal the second accommodating space 21. The backpack 2 or the second fixing portion 22 with different shapes, styles, colors, patterns or patterns can be replaced with each other to generate different visual matching changes, so as to increase the appearance variability.

The third embodiment of the present invention, as shown in fig. 10, is different from the first embodiment only in that the first connecting members 221 and the second connecting members 222 are separately provided from the second fixing portion 22. That is, a plurality of second fixing holes 223 are formed on the second fixing portion 22 at positions corresponding to the first fixing holes 123 of the first fixing portion 12. When the backpack 2 needs to be fixed to the first fixing portion 12, the first connecting members 221 or the second connecting members 222 only need to be passed through the second fixing holes 223 of the second fixing portion 22 and the first fixing holes 123 of the first fixing portion 12 and then adhered to each other, so that the backpack 2 with different sizes can be fixed to the first fixing portion 12.

In a fourth embodiment of the present invention, as shown in fig. 11, a female backpack 3 includes a strap surface 38 and an outer edge surface 39 opposite to the strap surface 38, the female backpack 3 has a first accommodating space 31 therein, the outer edge surface 39 is connected to a first fixing portion 32, and the first fixing portion 32 has a plurality of first fixing holes 323 therethrough. The first fixing portion 32 is provided with a first zipper 33 to be combined with the mother bag 3 to seal the first accommodating space 31.

At least one sub-backpack 4 movably fixed on the first fixing portion 32 of the main backpack 3. The inside of the sub-backpack 4 is provided with a second receiving space 41. The sub-backpack 4 is connected to a second fixing portion 42, and a plurality of second fixing holes 423 are formed at positions of the second fixing portion 42 corresponding to the first fixing holes 323 of the first fixing portion 32. The second fixing portion 42 is provided with a second zipper 43 to be combined with the backpack 4 to close the second accommodating space 41.

The connecting members 421 pass through the second fixing holes 423 of the backpack 4 and the first fixing holes 323 of the first fixing portion 32, and then are adhered and fixed to each other. Thus, the sub-backpacks 4 can be fixed on the first fixing portion 32 of the mother backpack 3 in different directions.

As shown in fig. 13, the first fixing portion 32 of the mother backpack 3 not only can fix the daughter backpack in different directions, but also can be provided with a plurality of rope-shaped connecting members 5 through the first fixing holes 323 of the first fixing portion 32, and the connecting members 5 can generate various visual aesthetic senses.

As shown in fig. 14, the elastic clamping force generated between the connecting members 5 can be used for clamping various articles 51.

As shown in fig. 15, or the connecting member 5 is inserted through the first fixing holes 323, so that the billboard 52, the signboard or the advertisement board can be hung to have the functions of advertisement and announcement.

As shown in fig. 16, the second fixing portion 42 of the sub-backpack 4 may be fixed with a pattern layer 53 having different shapes by bonding, adhering, or fastening, so as to enhance the appearance of the sub-backpack.

As shown in fig. 17, the second zipper 43 of the backpack 4 can be a four-head zipper structure, and two adjacent zipper tabs 431 are provided with fastening tapes 432 or other fastening elements for fastening, so that the two adjacent zipper tabs 431 can be fastened to each other to prevent the backpack 4 from being opened by arbitrarily pulling apart the two zipper tabs 431.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The utility model provides a combination knapsack of individualized storage space and molding, includes:

the female backpack comprises a backpack surface and an outer edge surface opposite to the backpack surface, wherein the outer edge surface is provided with a first fixing part which is oppositely provided with an outer side surface and an inner side surface;

the method is characterized in that: the first fixing part is provided with a plurality of first fixing holes which penetrate through the outer side surface and the inner side surface;

the backpack is movably fixed on the first fixing part, the backpack is connected with a second fixing part, a first direction and a second direction are defined on the second fixing part, a plurality of first connecting pieces and a plurality of second connecting pieces are arranged on the second fixing part, the first connecting pieces are arranged in pairs in opposite directions in the first direction, the second connecting pieces are arranged in pairs in opposite directions in the second direction, and the first connecting pieces or the second connecting pieces are combined with each other on the inner side surface after penetrating through the first fixing holes from the outer side surface.

2. The combination backpack of personalized accommodation space and styling as claimed in claim 1, wherein: the first direction and the second direction are perpendicular to each other, the first direction represents a transverse direction relative to the second fixing portion, and the second direction represents a longitudinal direction relative to the second fixing portion.

3. The combination backpack of personalized accommodation space and styling as claimed in claim 1, wherein: the first containing space is arranged in the female backpack, and the first fixing portion is provided with a first zipper for sealing the first containing space.

4. The personal storage space and styling combination backpack of claim 3, wherein: a covering sheet is arranged in the first accommodating space at a position adjacent to the first fixing portion, and the covering sheet is fixed on the first fixing portion by means of a plurality of adhesive tapes in an adhering manner so as to cover the first fixing hole.

5. The combination backpack of personalized accommodation space and styling as claimed in claim 1, wherein: the inside of sub-knapsack is equipped with a second accommodation space, the second fixed part is equipped with a second zip fastener to supply airtight the second accommodation space.

6. The personal storage space and styling combination backpack of claim 5, wherein: the backpack and the second fixing part are of a separated structure, so that the backpack or the second fixing part with different shapes, styles, colors, patterns or patterns can be replaced mutually.

7. The personal storage space and styling combination backpack of claim 6, wherein: the second zipper is provided with four zipper heads so as to pull two of the zipper heads, so that the two zipper heads form an opening position in any direction or angle.

8. The combination backpack of personalized accommodation space and styling as claimed in claim 1, wherein: the first connecting piece and the second connecting piece are respectively of a separated structure with the second fixing part.

9. The personal storage space and styling combination backpack of claim 8, wherein: the second fixing part is provided with a plurality of second fixing holes at positions corresponding to the first fixing holes of the first fixing part, and the first connecting piece or the second connecting piece penetrates through the second fixing holes and the first fixing holes respectively and then is bonded and fixed mutually.

10. The combination backpack of personalized accommodation space and styling as claimed in claim 1, wherein: the first fixing part is plate-shaped.

11. A kind of mother's knapsack, include a strap surface, and a outer edge surface opposite to said strap surface, the said outer edge surface has a first fixed portion, the said first fixed portion has a lateral surface and a medial surface relatively;

the method is characterized in that: the first fixing part is provided with a plurality of first fixing holes penetrating through the outer side face and the inner side face, and the first fixing holes are used for enabling a connecting piece to penetrate through the outer side face and then to be mutually combined on the inner side face, so that the connecting piece is fixed on the outer edge face.

12. The mother backpack of claim 11, wherein: the first fixing hole is internally provided with a plurality of rope-shaped connecting pieces in a penetrating way.

13. The mother backpack of claim 12, wherein: the elastic clamping force generated between the connecting pieces is utilized to clamp various articles.

14. The mother backpack of claim 11, wherein: the first fixing hole is used for hanging a bulletin board, a viewing board or an advertising signboard by using the connecting piece.

15. A backpack coupled to the mother backpack of claim 11, comprising:

the second fixing part is movably fixed on the first fixing part of the mother backpack;

the method is characterized in that: a plurality of second fixing holes which penetrate through the second fixing part are arranged at the positions, corresponding to the first fixing holes of the first fixing part, on the second fixing part;

the plurality of connecting pieces are respectively fixed on the inner side surface after the outer side surface penetrates through the second fixing hole and the first fixing hole.

16. The backpack of claim 15, wherein: the backpack is characterized in that a second containing space is arranged in the backpack, a second zipper is arranged on the second fixing portion to seal the second containing space, the second zipper is of a four-head zipper structure, and a fixing element is arranged on two adjacent zipper heads to enable the two adjacent zipper heads to be fixed mutually.