- sales@keweibag.com
- 3F, No.4 Building, Xihuyuanquan Office Building, No.188 Beiqing East Road, Fengze District, Quanzhou, China
Best Dry Bag Backpack Design for Brands
The best dry bags should be designed with the following features:
- Waterproof, UV-resistant, and abrasion-resistant materials
- Welded seams instead of stitched seams
- Roll-top closure for better airtight sealing
- Secure welded construction for straps and buckle attachment points
- Brand-matched color combinations and logo applications
Dry Bag Backpack Manufacturer in China
Designed to match the IPX6 rating, Kewei dry bag backpack is a 100% waterproof dry bag crafted for outdoor enthusiasts. We use high-grade materials that can withstand heavy rain like PVC-laminated polyester fabric, TPU, or heavy-duty nylon. As your custom wholesale waterproof dry bag manufacturer in China, we will help you choose the best material.
Our waterproof dry bag backpacks come in varying capacities from 20 liters to over 45 liters. Furthermore, we have incorporated a roll-top enclosure for an airtight seal, which improves protection from heavy rains. Depending on the color, design, or additional features you want, and through our ODM/OEM services, Kewei makes bags that resonate with your brand.
And that’s not all, all your custom dry bag backpacks feature reinforced construction, comfortable shoulder straps, padded shoulder straps, and adjustable straps. Additionally, you get splash-proof pockets, easy-to-grab handles, chest straps, and a waist belt for safety.
Choose Kewei as your ultimate supplier for roll-top dry bag backpacks today for a competitive edge in the dry bay industry. Whether you are a retailer or a new brand looking for a wholesale waterproof backpack supplier, Kewei is here to support you.
5L Waterproof Dry Bag
The 5-liter capacity can store the essentials for water sports or outdoor adventures.
Custom Fishing Dry Bag
High-frequency hot pressing process ensures seamless fusion of dry bag materials.
Roll Top Dry Bag Backpack
Toll top closure design improves waterproof performance and provides more flexible capacity.
Large Dry Bag Backpack
30L large capacity design can store more items, meeting the storage needs of overnight trips or beach parties.
Lightweight Dry Bag Backpack
Made of PVC material, it weighs only 0.2kg, making it lightweight and easy to carry.
Unisex Dry Bag Backpack
Roll-top design provides excellent waterproof performance, suitable for hiking and floating.
Portable Hiking Dry Bag
20L to 36L capacity provides generous storage space, making it suitable for hiking and outdoor activities.
Surfing Dry Bag Backpack
Front pocket with a waterproof polyester zipper, ideal for storing essentials such as IDs, keys, ect.
The OEM/ODM Customization Options Professional Dry Bag Backpack Manufacturer Provide
Kewei offers a wide range of dry bag customization options, including waterproof material selection, capacity, colors, printing, roll-top styles, pockets, shoulder straps, hardware, reinforcements, reflective panels, transparent windows, and packaging.
- Bag Size & Shape
- 5-80L
- Custom Shapes
- Transparent Window Design
- Wide-Bottom Standing Design
- Add-On Components
- Front Zipper Pocket
- Splash-proof Outer Pocket
- Inside Zipper Pocket
- Clear TPU Window
- Mesh Water Bottle Holder
- Removable Straps
- Compression Straps
- MOLLE Webbing
- Reflective Safety Strips
Widened handle design
- Unique Branding Options
- Silk Print
- Digital Print
- Reflective Print
- UV Print
- PVC Rubber Patch
- raised TPU Logo
- Embossed/ Debossed Logo
- Woven Label
- Large-format Brand Graphics
- Laser Engraving
- Packaging
- Individual Polybag
- Tube-style Packaging
- Branded Box
- Roll-up Packing for Space Savings
- FBA Packaging
What Scenarios Are Our Custom Waterproof Dry Bag Backpacks Suitable For?
- Kayaking & Canoeing: Our professional waterproof dry bag backpacks utilize a 100% waterproof high-frequency welding process, keeping contents dry during paddling and whitewater rafting.
- Maritime Industry: Marine-grade floating waterproof dry bag backpacks designed for boat equipment wholesalers and sailing gear suppliers effectively protect against salt spray and immersion.
- Hiking/Travel: Our lightweight TPU and PVC waterproof dry bag backpacks offer excellent protection without adding bulk, making them perfect for long-distance hikers and campers.
- Military/Government Units: Our heavy-duty tactical waterproof dry bag backpacks are manufactured to military and law enforcement standards and equipped with the MOLLE system to handle the most demanding missions.
- Outdoor Brand Promotions: High-quality waterproof dry bag backpacks with precise logo printing help businesses enhance brand awareness during promotional campaigns.
Which Materials Are Suitable for Your Dry Bag Project？
TPU
- Water pressure Resistance – 5000 mmHg and above
- Temperature Range – -30°C to +70°C
- Environmentally Friendly – Non-toxic, low odor, meets sustainable development standards
- Visibility – High transparency, suitable for custom transparent windows
- Cost – Relatively expensive, suitable for the mid-to-high-end market
Best for:
Premium Dry Bags/ Transparent Window Dry Bags/ Outdoor Waterproof Dry Bags
PVC
- Water pressure Resistance – Can withstand over 5,000 mm water pressure, helping block water effectively.
- Abrasion & Tear Resistance – High-quality PVC-coated fabric can reach ≥100/100 N tear strength and ≥1200/1000 N/5cm tensile strength.
- Stability – Performs well under UV exposure and is less likely to fade or age quickly.
- Easy Maintenance – Smooth surface, easy to clean and maintain.
- Cost – Moderate cost, suitable for entry-level to mid-range markets and large-volume dry bag orders.
Best for:
Roll-top Dry Bags/ Promotional Dry Bags/ Beach Dry Bags/ Kayaking Dry Bags/ Marine Bags/ Floating Dry Bags
Nylon Fabric
- Waterproof Performance – Waterproof performance can be improved with TPU, PVC, or PU coatings
- Weight – Lighter than PVC, soft, and easy to fold, making it more comfortable to use and ideal for packable waterproof storage bags.
- Durability – Strong tear resistance. 210D Oxford fabric can usually reach 500–600 N tensile strength, while 420D Oxford fabric can reach 900–1000 N, depending on the material and production process.
- Cost – Moderate cost, suitable for the mid-range market.
Best for:
Foldable Dry Bags/ Lightweight Waterproof Storage Bags/ camping Dry Sacks/ Hiking Dry Bags
Polyester Fabric
- Waterproof Performance: – By adding TPU or PU coatings.
- Abrasion Resistance: Excellent. Some of our 600D PU-coated polyester fabrics can reach ≥1554 N warp tensile strength and ≥1110 N weft tensile strength in ASTM D5034 testing.
- Stability: It has good UV resistance, is not easy to fade, and is suitable for outdoor dry bag projects.
- Customizability: High, especially with a wide range of color options.
- Cost: Low cost, suitable for entry-level markets or budget-limited projects.
Best for:
Entry-level Dry Bags/ Promotional Waterproof Dry backpacks/ Beach Dry Bags/ Lightweight Dry Sacks
500D / 1000D Cordura Fabric
- Waterproof Performance: It can be enhanced with PU or TPU coating to improve water resistance for dry bag applications.
- Weight: Relatively heavy. The higher the fabric density, the thicker and more durable the material becomes, but it also increases overall weight.
- Durability: Excellent. Cordura is a high-strength fabric designed for heavy-duty applications.
– 500D Cordura offers a good balance between durability and weight, making it suitable for mid-range outdoor dry bag projects.
– 1000D Cordura provides higher abrasion resistance and tear strength, making it ideal for heavy-duty and military-grade applications. - Cost: High cost, suitable for premium and heavy-duty dry bag projects.
Best for:
Heavy-duty Roll-Top Dry Bags/ Tactical Waterproof Dry backpacks/ Marine & Boating Dry Bags/Outdoor Dry Bags
As your dry bag supplier, Kewei provides a complete engineering & production system.
High Quality Dry Bag Backpack Customization Production Process
Bag Material Solution Recommendations
The material selection of a dry bag directly affects its waterproof performance, weight, hand feel, and durability. Our product development team has over 10 years of experience in custom bag manufacturing and is highly familiar with commonly used dry bag materials such as TPU, PVC, and nylon/polyester fabrics. Based on your requirements or target market positioning, we can provide professional material selection recommendations.
Below are the key evaluation criteria we use when selecting materials for custom dry bag projects:
- Hydrostatic Pressure (Water Column Rating)
- Tear Strength
- Puncture Resistance
- UV Resistance (long-term sun exposure durability)
- Flexibility for repeated rolling and folding
Welding & Seaming Technology (Needle‑Free Seams)
Over 90% of dry bag leaks occur at the seams, not the fabric itself. Using welding and sealing technology instead of traditional needle and thread stitching reduces the risk of leakage due to needle holes at the seams.
At Kewei, our thermal welding capabilities include:
- High‑Frequency (RF) Welding – Fuses TPU, PVC, and coated fabrics at the molecular level, creating a completely seamless, needle‑free bond.
- Hot‑Air Welding – Produces a continuous, uninterrupted weld bead that forms a reliable waterproof barrier along the seam.
- Hot‑Wedge Welding – Uses a heated metal wedge to melt and fuse materials under pressure, eliminating the need for stitching on the waterproof panel.
Closure Design
For custom dry bag projects, Kewei recommends using a roll-top seal instead of zippers to ensure a better seal.
Our roll-top closure features include:
- Roll length – Designed for 3–4 folds, delivering a tighter seal while allowing flexible adjustment of storage capacity.
- Internal stiffening strip – Keeps the rolled top straight and makes closure quick and easy.
- Buckle and clip placement – Side buckles, front side-clip design, and integrated D-rings for kayak tie-downs work together to seal the bag securely and reliably.
Carry Systems & Attachment Points
Each style features a tailored carry system that balances comfort, durability, and waterproof integrity:
Single‑Shoulder Dry Bags (5L–20L)
- Detachable, adjustable shoulder strap
- Side‑mounted D‑rings (RF‑welded for secure attachment)
Backpack Dry Bags (20L–55L)
- Padded, contoured shoulder straps
- Adjustable sternum strap for load stability
- RF‑welded reinforcement patches at strap anchor points to distribute weight and prevent tear‑out
- Ergonomically shaped back panel with EVA foam padding and air‑channel ventilation
Kayak & Boat Mounting
- RF‑welded D‑rings for tie‑down points
- Reinforced mounting loops for secure boat attachment
- Compatible with standard straps and lashing systems
Performance Optimization
To ensure the durability and stability of our waterproof dry bags, we employ the following design features:
- Thickened base
- Optional reinforced base
- Double stress zones
- UV-stabilized topcoat
Furthermore, we conduct professional tests, including:
- Abrasion resistance test
- Tear strength test
- UV resistance test
- Flexibility crack test
- Hydrostatic pressure test
All tests are performed according to industry standards to ensure that every dry bag leaving the factory has stable waterproof performance and a long service life.
Floating & Buoyancy Engineering
For kayaking, stand-up paddleboarding, rafting, and water sports enthusiasts, having a waterproof dry bag that floats on water is crucial. Kewei offers the following solutions:
- Using puncture-resistant TPU/PVC coated composite material with a rolled-top seal for buoyancy
- Built-in closed-cell buoyancy material
- Welded seal between materials to create air chambers, equipped with an inflation valve
To ensure buoyancy performance, we test:
- Controlled immersion test
- Float test under heavy load
- Time-based buoyancy performance
Why Choose Kewei as Your Waterproof Dry Bag Backpack Manufacturing Partner
As a professional waterproof bag manufacturer, Kewei provides one-stop OEM/ODM solutions for waterproof dry bags. We have strong capabilities in custom design and mass production, serving brands that are looking for reliable and scalable waterproof bag manufacturing.
- 20+ years of bag manufacturing experience
- 70,000+ sqm modern factory space and 300+ skilled workers to ensure efficiency and quality
- One-stop OEM/ODM service, with low MOQ from 300 pcs
- 20+ in-house R&D professionals dedicated to developing new waterproof bag projects
- Free sample design support, with fast development within 7–14 days
- Strong expertise in waterproof construction, welding technology, and technical bag manufacturing
- Good understanding of outdoor market expectations and customer feedback
- Professional sales team with fast response, replying within 24 hours
- Focused on long-term partnerships, not one-time orders
Kewei is not simply a low-cost production factory, but your bag solution provider.
what is a wet dry bag
A wet/dry bag is a smart storage solution that keeps messy and clean items securely separated in one compact package. These versatile bags feature waterproof compartments (typically made from durable TPU or PEVA) that prevent leaks, while the separate dry section keeps essentials protected. Unlike disposable plastic bags, they’re built to last with reinforced seams and reusable closures like snap buttons or roll tops.
Perfect for parents, swimmers, travelers, and outdoor enthusiasts, these bags handle everything from soiled baby clothes to wet gym gear without cross-contamination. The best designs add thoughtful touches like ventilated pockets for odor control, machine-washable materials for easy cleaning, and compact folding for storage. Whether you’re heading to the pool, the playground, or a weekend trip, a quality wet/dry bag eliminates the hassle of carrying multiple containers while keeping your belongings organized and dry.
How does a wet dry bag work?
A wet/dry bag works through intelligent compartment design that physically separates wet and dry items while keeping everything contained in one portable package. The waterproof section (typically made from durable TPU or PEVA material) securely holds damp or soiled contents without leaking, while the separate dry compartment maintains a clean space for fresh items. A reliable closure system – whether roll-top, zipper, or snap-seal – creates an airtight barrier between sections to prevent cross-contamination.
These bags shine in real-world situations: parents stash dirty diapers in the wet zone while keeping spare clothes dry, swimmers toss wet gear in one side and towels in the other, and travelers prevent shampoo leaks from ruining clothes. Unlike disposable plastic bags, quality wet/dry bags feature reinforced seams and machine-washable materials for long-term use. The best designs even incorporate handy extras like ventilation panels to reduce odors and compact folding for easy storage when not in use.
Are dry bags 100% waterproof?
High-quality dry bags can indeed be 100% waterproof when properly constructed and used. The most reliable bags feature welded TPU or PVC construction (not stitched seams) and a 3-4 fold roll-top closure that creates a watertight seal. These professional-grade bags often carry an IPX7 or IPX8 rating, meaning they can withstand complete submersion for extended periods – ideal for kayaking, diving, or whitewater rafting.
However, not all “waterproof” bags perform equally. Lower-cost options using coated fabrics or stitched seams may resist light rain but fail during full immersion or prolonged exposure. For critical applications, look for pressure-release valves and thick 500D+ material that resists punctures. Remember that even the best dry bags require proper care – regular inspection of seams and correct closure techniques ensure ongoing protection. While no bag is indestructible, a well-made dry bag from reputable brands will keep your gear completely dry in the harshest conditions.
