A waterproof travel bag with expansion function
By designing an expanded waterproof structure in the travel bag, the problem of umbrella moisture contaminating dry items is solved, achieving isolation between wet and dry items and rapid drainage, thus improving user convenience and the dryness of items.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ENDIAN (GUANGDONG) LEATHER GOODS & FASHION TECH CORP
- Filing Date
- 2025-08-13
- Publication Date
- 2026-07-07
AI Technical Summary
Existing travel bags lack a dedicated area for storing wet umbrellas, which makes it easy for moisture from the umbrellas to wet the items inside the bag, affecting user operation and the dryness of the items.
An expandable waterproof travel bag has been designed, comprising a main bag body and an expandable bag. The expandable bag is connected to the main bag body by a waterproof sealing strip and has a drainage hole at the bottom. The cover is fixedly connected to the main bag body. The cover body made of elastic material and the waterproof sealing strip form a sealing structure to achieve physical isolation between wet and dry items and rapid drainage.
It effectively isolates damp items from dry items, prevents moisture buildup, keeps items inside the bag dry, and allows for convenient one-handed operation to store wet items, improving travel convenience and efficiency.
Smart Images
Figure CN224461232U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of travel bag technology, specifically to an expandable waterproof travel bag. Background Technology
[0002] As an essential piece of travel equipment, the functionality and convenience of travel bags directly impact the user experience. While existing travel bags meet basic storage needs, they still have some pain points that urgently need to be addressed.
[0003] Existing travel bags generally lack a dedicated area or structure for storing wet umbrellas. When users encounter rain, the surface of the umbrella becomes heavily wet after use. Holding it directly in hand severely restricts the user's freedom of movement, making it extremely inconvenient when handling luggage, documents, or other activities simultaneously. If users are forced to place the wet umbrella directly into the main compartment or a regular side pocket of the travel bag, the moisture from the umbrella will quickly soak the originally dry items inside. Therefore, this utility model proposes an expanded-capacity waterproof travel bag. Utility Model Content
[0004] The purpose of this invention is to provide an expandable waterproof travel bag to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an expandable waterproof travel bag, comprising a main bag body and an expandable bag; the expandable bag is disposed on the side of the main bag body, and its edge is connected to the main bag body by a waterproof sealing strip; the expandable bag, in a contracted state, forms a planar seal by its own elasticity against the main bag body; a drainage hole is provided at the bottom of the expandable bag; a cover is provided at the opening of the expandable bag, and the cover is fixedly connected to the main bag body.
[0006] Preferably, the waterproof sealing strip has an I-shaped cross-section, with the grooves on both sides covering the inserts on the outside of the main bag and the expansion bag, respectively.
[0007] Preferably, both the waterproof sealing strip and the insert are made of TPU material.
[0008] Preferably, the inner wall of the slot is provided with serrated protrusions.
[0009] Preferably, the insert surfaces of the main bag body and the expansion bag are configured with a corrugated structure matching the serrated protrusions.
[0010] Preferably, the cap is made of elastic material, and its fixing part to the main bag body is located on the outside of the bag opening of the expansion bag.
[0011] Preferably, the opening of the expansion bag extends into the inside of the cap.
[0012] Preferably, the cap is used to press the opening of the expanded bag with elastic deformation and cooperate with the waterproof sealing strip to form a sealing structure.
[0013] Compared with traditional technologies, the beneficial effects of this utility model are:
[0014] This device features an independent expansion bag with a bottom drainage hole on the side of the main bag, along with a waterproof sealing strip on the edge. This design completely isolates wet items from dry items inside the main bag. The drainage hole at the bottom of the expansion bag quickly drains water from the surface of the items, preventing moisture from accumulating or seeping back into the bag. This solves the problem of wet items soaking and contaminating other luggage, ensuring the dryness and cleanliness of the items inside the bag.
[0015] The elastic cover is fixed to the outside of the expansion bag opening. Users only need to pull open the cover, put in the wet items, and then release it. The cover will automatically press and seal the bag opening using its own elasticity. This design eliminates the need for additional opening and closing locks or complicated operations, allowing users to quickly store wet items with one hand, freeing up their hands and enabling them to handle luggage, documents, or perform other activities freely in rainy conditions, increasing the convenience and efficiency of travel.
[0016] The expandable bag, thanks to its own elasticity, forms a flat seal against the main bag when contracted, ensuring the overall structure's compactness and waterproofness when not in use; when unfolded, it provides flexible storage space through elastic deformation, accommodating wet items of different volumes; at the same time, it allows internal water to drain out, achieving the effects of dry and wet separation and rapid drainage. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0018] Figure 2 This is a cross-sectional view of the overall structure of this utility model;
[0019] Figure 3 This is a schematic diagram of the internal structure of the expansion bag of this utility model;
[0020] Figure 4 This is a schematic diagram of the waterproof sealing strip of this utility model.
[0021] In the diagram: 1-Main bag body; 2-Expansion bag; 3-Waterproof sealing strip; 4-Drainage hole; 5-Cap; 6-Slot; 7-Insertion strip; 8-Zergling protrusion. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0023] Example 1:
[0024] Please see Figures 1-4 The illustration shows an expandable waterproof travel bag, including a main bag body 1 and an expandable bag 2. The expandable bag 2 is located on the side of the main bag body 1, and its edge is connected to the main bag body 1 by a waterproof sealing strip 3. When the expandable bag 2 is in a contracted state, it forms a flat seal by its own elasticity against the main bag body 1, effectively reducing the space occupied and preventing external liquid from seeping in. The bottom of the expandable bag 2 is provided with a drain hole 4, which can actively drain the liquid accumulated inside the expandable bag 2 to avoid liquid accumulation. The opening of the expandable bag 2 is provided with a cover 5, which is fixedly connected to the main bag body 1. The cover 5 forms a sealing barrier and works with the waterproof sealing strip 3 to prevent liquid from entering the main bag body 1 from the opening and side of the expandable bag 2, realizing the functions of wet isolation and self-drainage.
[0025] The following describes some embodiments of this application in detail with reference to the accompanying drawings:
[0026] Please see Figures 1-4 By setting an independent expansion bag 2 with a bottom drainage hole 4 on the side of the main bag 1, and with the design of a waterproof sealing strip 3 on the edge, it is possible to completely physically isolate wet items from dry items inside the main bag 1; the drainage hole 4 at the bottom of the expansion bag 2 can quickly drain water from the surface of the items out of the bag, preventing water from accumulating or seeping back into the bag, solving the problem of wet items soaking and contaminating other luggage, and ensuring the dryness and cleanliness of the items inside the bag.
[0027] Among them, the cross-section of the waterproof sealing strip 3 is I-shaped, and the grooves 6 on both sides of it respectively cover the insert strips 7 set on the outside of the main bag body 1 and the expansion bag 2, forming a mechanical interlocking connection; the wrapping structure of the grooves 6 always maintains the positioning of the insert strips 7 when the expansion bag 2 is expanded or contracted, preventing the sealing failure caused by twisting and deformation at the connection, and at the same time providing a buffer space for the relative deformation between the two bags, ensuring long-term sealing stability under dynamic use;
[0028] Meanwhile, both the waterproof sealing strip 3 and the insert 7 are made of TPU material, which has high elasticity, hydrolysis resistance and anti-aging properties. The TPU sealing strip can still recover its original shape under repeated deformation, maintaining the tight wrapping force of the slot 6 on the insert 7. The TPU insert 7 resists external friction and erosion in a humid environment, preventing the sealing strip from falling off or cracking due to material deterioration, thus ensuring the durability of the waterproof connection from the material level.
[0029] Furthermore, the inner wall of the slot 6 is provided with serrated protrusions 8, and the surface of the insert 7 of the main bag body 1 and the expansion bag 2 is set with a corrugated structure matching the serrated protrusions 8. The peaks and valleys of the corrugations interlock with the serrations, restricting the displacement freedom of the insert 7. The continuous curved surface distribution of the corrugations further increases the contact area, so that the liquid needs to go through a longer tortuous path to penetrate, thereby improving the liquid barrier capability of the sealing interface.
[0030] In addition, the cover 5 is made of elastic material, and its fixing part to the main bag body 1 is located on the outside of the bag opening of the expansion bag 2. The elasticity allows the cover 5 to be pulled open laterally to expose the bag opening. When the external force is released, the cover 5 automatically springs back to the initial position, providing pre-tightening force for the subsequent bag opening compression and sealing. At the same time, the external fixing design avoids the sealing failure caused by the cover 5 shifting or flipping.
[0031] It is worth noting that the cap 5 continuously presses the opening of the expansion bag 2 with radial pressure generated by elastic deformation, forming a dynamic top seal; this pressure, together with the side seal of the waterproof sealing strip 3 and the bottom drainage hole 4, constitutes a three-dimensional protection system: the top seal prevents external liquid from flowing in, the side seal prevents liquid from penetrating laterally into the main bag body 1, and the bottom drainage hole 4 unidirectionally discharges the internal accumulated liquid.
[0032] The working principle of this device is as follows:
[0033] When there is no need to store wet items, the elastic expansion bag 2 is in a contracted state, and its edges are tightly connected to the main bag body 1 by an I-shaped waterproof sealing strip 3. Due to its elasticity, the expansion bag 2 adheres tightly to the surface of the main bag body 1, forming a planar seal. At this time, the serrated protrusions 8 in the sealing strip groove 6 interlock with the corrugated structure on the surface of the main bag body 1 and the expansion bag 2 insert strip 7, and combined with the deformation resistance of the TPU material, form a side barrier to prevent liquid penetration; simultaneously, the elastic cap 5 fixed to the outside of the expansion bag 2 opening naturally covers the opening of the expansion bag 2, forming a pre-seal.
[0034] When a user needs to store a wet umbrella in the rain, they simply pull open the cover 5 horizontally to expose the opening of the expansion bag 2 that extends into the inside of the cover 5. After placing the wet item into the expansion bag 2, the cover 5 is released. The cover 5 automatically springs back using its elasticity, and the resulting radial pressure seals the bag opening, creating a dynamic seal at the top. This process can be completed with one hand, and the cover 5's wrap-around design eliminates gaps at the bag opening edges.
[0035] After the liquid on the surface of the wet item accumulates inside the expansion bag 2, the continuous pressure of the cover 5 prevents external rainwater from entering and also prevents internal liquid from splashing out; the serrated structure of the waterproof sealing strip 3 maintains the seal at the side connection when the expansion bag 2 is deformed under load, preventing the liquid from penetrating laterally into the main bag body 1; the liquid is actively discharged outside the bag through the drain hole 4 at the bottom of the expansion bag 2, avoiding backflow of water and contamination of the items.
[0036] After the wet item is removed, the expansion bag 2 retracts and re-fits the surface of the main bag 1 using its own elasticity. The cap 5 automatically covers the bag opening, and the TPU insert 7 inside the I-shaped sealing strip returns to its original shape after deformation, ensuring the integrity of the sealing interface and preparing for the next use.
[0037] Example 2:
[0038] This embodiment is an optimization of the structure in Embodiment 1. Specifically, as follows: Figure 2 As shown, the opening of the expansion bag 2 extends into the inside of the cover 5, so that the elastic rebound force of the cover 5 acts directly on the outer wall of the bag opening; during the reset process, the cover 5 forms a full wrap around the circumference of the bag opening, eliminating the assembly gap between the edge of the bag opening and the cover 5, and geometrically blocking the channel for liquid to enter from above.
[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.
[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An expandable waterproof travel bag, comprising a main bag body (1) and an expandable bag (2); Its features are: The expansion bag (2) is disposed on the side of the main bag body (1), and its edge is connected to the main bag body (1) by a waterproof sealing strip (3); When the expansion bag (2) is in a contracted state, it forms a planar seal by its own elasticity against the main bag body (1); The expansion bag (2) is provided with a drainage hole (4) at the bottom; The expansion bag (2) has a cover (5) at the bag opening, and the cover (5) is fixedly connected to the main bag body (1).
2. The expandable waterproof travel bag according to claim 1, characterized in that: The waterproof sealing strip (3) has an I-shaped cross section, and the slots (6) on both sides of it respectively cover the inserts (7) provided on the outside of the main bag body (1) and the expansion bag (2).
3. The expandable waterproof travel bag according to claim 2, characterized in that: Both the waterproof sealing strip (3) and the insert strip (7) are made of TPU material.
4. The expandable waterproof travel bag according to claim 2, characterized in that: The inner wall of the slot (6) is provided with serrated protrusions (8).
5. The expandable waterproof travel bag according to claim 4, characterized in that: The surface of the insert (7) of the main bag body (1) and the expansion bag (2) is configured with a corrugated structure matching the serrated protrusion (8).
6. The expandable waterproof travel bag according to claim 1, characterized in that: The cover (5) is made of elastic material, and its fixing part to the main bag body (1) is located outside the bag opening of the expansion bag (2).
7. The expandable waterproof travel bag according to claim 6, characterized in that: The opening of the expansion bag (2) extends into the inside of the cover (5).
8. The expandable waterproof travel bag according to claim 7, characterized in that: The cover (5) presses the opening of the expansion bag (2) with elastic deformation and cooperates with the waterproof sealing strip (3) to form a sealing structure.