Sealock manufactures the Waterproof Zipper Backpack with Curved Top Opening and Ventilated Back for buyers who want dry-bag protection with the convenience of a normal zip backpack. As a welded waterproof-bag factory, we build the body from coated waterproof fabric with welded seams and close it with laminated waterproof zippers — one curving across the top for a wide main opening, one vertical on the front, one on the side. Rated IPX6, it keeps rain, spray and dust off your gear, while a channelled ventilated back panel and a padded harness with a hip strap make it comfortable to carry all day.
At a Glance
Curved top waterproof zipper — wide, easy access without a roll-top.
Three sealed zip openings — main, front vertical pocket and side pocket.
Channelled ventilated back — grooved padding keeps air moving on your back.
Full padded harness — S-shaped straps, shoulder D-rings and a hip strap.
Reinforced base + mesh pockets — two-tone build with dual bottle pockets.
Curved Top Waterproof Zipper
Instead of a roll-top you have to unroll every time, the main compartment opens along a waterproof zipper that curves across the top of the pack — so it opens wide, stays easy to pack, and closes in one pull. The laminated zipper tape keeps rain and splash out of the seam, and the welded body has no exposed stitching for water to work through. Rated IPX6, it is built for heavy rain, spray and dust rather than submersion, and we confirm the seal on every bag with a heavy rain and water-jet test appropriate to that rating.
Three Sealed Openings, Organized Access
Three separate waterproof zip openings keep things sorted: the curved top zip for the main compartment, a long vertical zip pocket on the front for a phone, wallet or documents, and a side zip pocket for the items you grab without taking the pack off. Two stretch mesh side pockets hold bottles or a folded layer.
Channelled Ventilated Back and Padded Harness
The back panel uses deep horizontal padded channels that create airflow gaps against your back, cutting the sweat build-up of a flat coated pack. Contoured S-shaped padded shoulder straps spread the load, D-rings on the straps take accessories, and a webbing hip strap steadies the pack when you are moving. A top webbing grab handle with a metal adjuster makes it easy to lift or hang.
1. Engineering Specifications
|
Item
|
Specification
|
|
Brand
|
SEALOCK
|
|
Model No.
|
SL-E328
|
|
Product Name
|
Waterproof Zipper Backpack
|
|
Product Category
|
Waterproof Backpack / Daypack
|
|
Construction Type
|
Structured Zip-Opening Waterproof Daypack
|
|
Manufacturing Process
|
High-Frequency Welded Seams + Reinforced Stitching
|
|
Waterproof Structure
|
Welded Body + Laminated Waterproof Zippers
|
|
Main Closure
|
Curved Top Waterproof Zipper
|
|
Waterproof Rating
|
IPX6
|
|
Capacity
|
approx. 25L
|
|
Dimensions
|
approx. 30 × 18 × 48 cm
|
|
Weight
|
approx. 0.9–1.1 kg
|
|
Back System
|
Channelled Ventilated Padded Back Panel
|
|
Carry System
|
Contoured Padded S-Straps + Hip Strap + Top Grab Handle
|
|
Base
|
Reinforced Contrast Base
|
|
Colour
|
Purple / Tan (shown) — custom colours available
|
|
Country of Origin
|
Guangdong, China
|
2. Material Specifications
|
Component
|
Material
|
Purpose
|
|
Outer Shell
|
Coated Waterproof Fabric (PVC laminated)
|
Waterproofing & abrasion resistance
|
|
Base Panel
|
Reinforced Coated Fabric
|
Wear resistance where the pack sits down
|
|
Seams
|
High-Frequency Welded
|
Needle-hole-free waterproof joints
|
|
Zippers
|
Laminated Waterproof Zippers
|
Seal the main, front and side openings
|
|
Zipper Pulls
|
Moulded Pulls with Cord Loops
|
Easy grip with wet or gloved hands
|
|
Back Panel
|
Channelled Foam Padding with Fabric Cover
|
Airflow and cushioning against the back
|
|
Shoulder Straps
|
Contoured Foam-Padded Webbing
|
Load distribution and comfort
|
|
Side Pockets
|
Stretch Mesh
|
Bottle and quick-stash storage
|
|
Hardware
|
Metal Strap Adjuster · D-Rings · Webbing
|
Adjustment and accessory attachment
|
3. Functional Specifications
|
Feature
|
Description
|
|
Waterproof Protection (IPX6)
|
Welded body with laminated waterproof zippers keeps gear dry through heavy rain and spray.
|
|
Wide Curved Opening
|
The top zip curves across the pack for a wide opening — easier to pack than a roll-top.
|
|
Three Zip Compartments
|
Main, front vertical and side zip openings separate valuables from bulk gear.
|
|
Back Ventilation
|
Channelled padding creates airflow gaps to reduce sweat build-up on the back.
|
|
Load Stability
|
Contoured padded straps plus a hip strap keep the pack steady while moving.
|
|
Bottle Storage
|
Dual stretch mesh side pockets hold bottles or a folded layer.
|
|
Accessory Attachment
|
Front webbing lash points, shoulder D-rings and a metal adjuster take clip-on gear.
|
|
Dust Protection
|
Sealed zip openings keep dust and sand out in transit.
|
|
Easy Maintenance
|
Coated surface wipes clean of mud, salt and dust.
|
4. Customization / OEM Specifications
|
Option
|
Available
|
|
Fabric Colour
|
Custom Pantone / two-tone combinations
|
|
Fabric Type
|
TPU or PVC laminated, thickness to spec
|
|
Capacity / Dimensions
|
Customizable
|
|
Waterproof Level
|
IPX6 standard; airtight-zipper upgrade available for higher rating
|
|
Pocket Quantity
|
Configurable (front / side / internal)
|
|
Laptop Sleeve
|
Optional
|
|
Internal Divider
|
Optional
|
|
Reflective Trim
|
Optional
|
|
Hip Belt Upgrade
|
Optional (padded belt with pocket)
|
|
Logo Methods
|
Silk-screen · Heat-transfer · Rubber patch · Welded patch · Embroidery
|
|
Full Custom Development
|
Ground-up development from sketch, sample or target spec
|
|
MOQ
|
300 pcs
|
|
Sample Lead Time
|
7–15 days
|
|
Production Lead Time
|
30–45 days
|
|
Factory Audit
|
Available
|
|
OEM / ODM
|
Supported
|
Our OEM/ODM capability goes well beyond colour and logo changes: bring a sketch, a sample or a target spec — capacity, IPX rating, fabric, zipper type, harness and pocket layout — and our China base develops it from the ground up into a finished original product. Ground-up development needs longer lead time than a stock-colour change, so share your launch date and we will schedule sampling.
5. Packaging Specifications
|
Item
|
Details
|
|
Individual Packaging
|
PE Bag
|
|
Carton Type
|
5-Layer Export Carton
|
|
OEM Carton Printing
|
Available
|
|
Barcode Label
|
Available
|
|
Hang Tag / Care Label
|
Available (OEM)
|
|
Shipping Mark
|
Available
|
|
Pallet Packing
|
Optional
|
Engineered For Real Outdoor Scenarios
🏙️
Daily Commuting
Quick curved top zip access enables effortless laptop and file extraction during rainy urban transits.
🚴
Cycling & Riding
Channelled ventilated back panel channels airflow, cutting sweat build-up during intense road rides.
🏔️
Hiking & Day Trips
S-shaped padded shoulder straps and steadying hip straps spread dynamic loads across mountain paths.
🏕️
Travel & Camping
Reinforced contrast base panel takes rough ground wear while IPX6 seals lock out heavy downpours.
⛵
Beach & Boating Splash
Laminated waterproof zippers and dual mesh side pockets protect accessories against heavy deck spray.
Quality Inspection Standards
|
Inspection Item
|
Standard
|
|
Fabric Inspection
|
100%
|
|
Weld Seam Inspection
|
100%
|
|
Waterproof Zipper Test
|
100%
|
|
Heavy Rain / Water-Jet Test (IPX6)
|
Batch sampling
|
|
Strap & Handle Load Test
|
Random sampling
|
|
Colour Consistency
|
100% vs. signed sample
|
|
Appearance Inspection
|
100%
|
|
Carton Inspection
|
100%
|
Inspection runs IQC on incoming fabric, zippers and hardware, IPQC on welds and zipper installation in process, and OQC before shipment with an AQL check and a signed golden-sample comparison. Third-party inspection (SGS / QIMA) is available on request.
Product Highlights
|
Feature
|
Advantage
|
|
Curved Top Zip Opening
|
Wide, fast access — no rolling and unrolling
|
|
Welded Body
|
No needle holes, so water has no path in
|
|
Laminated Waterproof Zippers
|
Sealed openings on main, front and side
|
|
Channelled Ventilated Back
|
Cooler, drier back than a flat coated panel
|
|
Reinforced Base
|
Takes the wear where the pack sits down
|
|
Two-Tone Design
|
Retail-ready look, easy to customize per brand
|
Printing & Logo Options
Brand it your way: silk-screen, heat-transfer, rubber patch, welded patch and embroidery, in a custom two-tone Pantone colourway.
OEM / ODM and Wholesale
As the factory, we supply this waterproof backpack for OEM, ODM and wholesale buyers from an MOQ of 300 pcs, FOB Guangdong, with samples in 7–15 days and production in 30–45 days. We customize colours, fabric, capacity, pocket layout, harness and logo, and offer full ground-up custom development. For a custom or wholesale waterproof backpack program under your own brand, send your spec and target quantity and we will quote against it.
FAQ
How waterproof is it?
It is rated IPX6 with a welded body and laminated waterproof zippers, so it keeps out heavy rain, spray and dust. It is built for wet weather rather than full submersion — for submersible protection, choose our airtight-zipper or roll-top models.
Why a curved top zipper instead of a roll-top?
The curved zip opens the pack wide in one pull, so it is faster to pack and unpack for daily use, while still sealing against rain.
Does the back panel really ventilate?
Yes. The deep padded channels hold the pack body off your back so air can move through the gaps, which reduces sweat build-up compared with a flat coated panel.
What are the MOQ and lead times?
MOQ is 300 pcs, FOB Guangdong, with samples in 7–15 days and production in 30–45 days. Custom colours, fabric, capacity and logos are available. Send your spec for a quote.
Request a Quote
Sealock (YiFuLong Outdoor Gear Co., Ltd.) has built welded waterproof gear in Guangdong since 2003. To order this waterproof backpack or start an OEM/ODM program, send us your colours, capacity, fabric, logo and target quantity for pricing and lead time. MOQ 300 pcs · samples 7–15 days · production 30–45 days.
YiFuLong Outdoor Gear Co., Ltd. (Sealock)
Email: info@sealock.com.hk · Tel: +86-13632981825
Hot Tags: Waterproof Zipper Backpack with Curved Top Opening and Ventilated Back, China, Manufacturers, Suppliers, Factory, Wholesale
