24L Waterproof Backpack with Airtight Zipper and Minimalist Design

Sealock manufactures the 24L Waterproof Backpack with Airtight Zipper and Minimalist Design, model SL-E641, for buyers who want true waterproof protection in a pack that looks at home in a city as well as on the water. As a welded waterproof-bag factory, we seal the main compartment with a genuine airtight waterproof zipper — not a coated coil zip under a flap — so this waterproof backpack carries an IPX7 rating and keeps a laptop, documents and daily gear dry through heavy rain or an accidental dunk. The matte, logo-light shell keeps the look clean, and a contoured padded back panel with a sternum strap makes 24L comfortable to carry.

At a Glance

• Genuine airtight waterproof zipper — IPX7 sealing across the curved top opening.
• Clean minimalist shell — matte finish, no clutter, four understated colours.
• Side waterproof zip pocket — sealed quick access without opening the main bag.
• Contoured padded back — chevron-channelled padding with padded straps and sternum strap.
• 24L urban size — 27.5 × 16.5 × 54 cm, with a webbing grab strip and top handle.

Airtight Waterproof Zipper, IPX7

The main compartment closes with a genuine airtight waterproof zipper that runs across the curved top of the pack, and the welded shell has no exposed stitching for water to work through. Rated IPX7, it protects the contents through heavy rain, spray and brief immersion — the level of sealing you would expect from a roll-top dry bag, with the speed and full access of a zipper. We verify the seal on every unit with a full water-immersion test, submerging the closed pack for more than two hours and confirming the inside stays dry.

Minimalist, Wipe-Clean Shell

The body is a smooth matte waterproof laminate with an understated tonal logo and a clean panel outline on the front — a pack that reads as an urban daypack rather than technical kit, which is exactly what a lot of retail buyers want. It comes in four quiet colourways: navy, cream, grey and green. The coated surface wipes clean of rain, dust and city grime in seconds.

Side Waterproof Zip Pocket

A waterproof zip pocket set into the side panel gives you sealed, one-hand access to a phone, wallet, keys or a transit card without opening the main compartment — useful in the rain, on a bike or at a gate. Dual side pockets take a bottle or a folded layer.

Contoured Padded Back and Harness

The back panel uses chevron-channelled foam padding that cushions the load and opens airflow gaps against your back, and contoured padded shoulder straps with a sternum strap keep a full 24L stable on the move. A reinforced top grab handle and a vertical webbing grab strip on the front make the pack easy to lift, hang or pull off a rack.

1. Engineering Specifications

Item	Specification
Brand	SEALOCK
Model No.	SL-E641
Product Name	Waterproof Backpack with Airtight Zipper
Product Category	Waterproof Backpack / Daypack
Construction Type	Structured Zip-Opening Waterproof Daypack
Manufacturing Process	High-Frequency Welded Seams
Waterproof Structure	Welded Body + Airtight Waterproof Zipper
Main Closure	Airtight Waterproof Zipper (curved top opening)
Waterproof Rating	IPX7
Dimensions	27.5 × 16.5 × 54 cm (L × W × H)
Capacity	24L
Net Weight	approx. 1.0 kg
Side Pocket	Waterproof Zip Pocket
Side Storage	Dual Side Pockets
Back System	Chevron-Channelled Padded Back Panel
Carry System	Contoured Padded Shoulder Straps + Sternum Strap + Top Grab Handle
Front Detail	Vertical Webbing Grab Strip
Colour	Navy · Cream · Grey · Green
Country of Origin	Guangdong, China

2. Material Specifications

Component	Material	Purpose
Outer Shell	TPU Laminated Waterproof Fabric, matte finish	Waterproofing & abrasion resistance
Seams	High-Frequency Welded	Needle-hole-free waterproof joints
Main Zipper	Airtight Waterproof Zipper	Seals the main compartment to IPX7
Pocket Zipper	Waterproof Zipper	Sealed quick-access side storage
Zipper Pulls	Moulded Pulls	Grip with wet or gloved hands
Back Panel	Chevron-Channelled Foam with Fabric Cover	Cushioning and airflow against the back
Shoulder Straps	Contoured Foam-Padded Webbing	Load distribution and comfort
Sternum Strap	Webbing with Quick-Release Buckle	Stabilizes the load on the move
Grab Strip / Handle	Reinforced Nylon Webbing	Lifting, hanging and pulling
Side Pockets	Stretch Fabric	Bottle and quick-stash storage

3. Functional Specifications

Feature	Description
Waterproof Protection (IPX7)	Airtight zipper on a welded body keeps contents dry through heavy rain, spray and brief immersion.
Full Zip Access	Curved top opening gives fast, wide access — no rolling and unrolling.
Sealed Side Pocket	Waterproof zip pocket for phone, wallet and keys without opening the main compartment.
Load Comfort	Chevron-channelled padded back with contoured straps and a sternum strap carries 24L securely.
Back Ventilation	Channelled padding creates airflow gaps to reduce sweat build-up.
Minimalist Styling	Matte shell and tonal logo suit both urban retail and outdoor channels.
Dust & Sand Proof	Sealed zippers keep dust, sand and grit out of the main compartment.
Easy Maintenance	Coated surface wipes clean of mud, salt and city grime.

4. Customization / OEM Specifications

Option	Available
Fabric Colour	Four stock colours · custom Pantone
Fabric Type	TPU or PVC laminated, denier and thickness to spec
Capacity / Dimensions	Customizable
Zipper Type	Airtight waterproof (standard) or water-resistant laminated
Laptop Sleeve	Optional (padded / shockproof)
Internal Divider & Pockets	Optional
Pocket Quantity / Layout	Configurable
Reflective Trim	Optional
Hip Belt	Optional
Logo Methods	Silk-screen · Heat-transfer · Rubber patch · Welded patch · Embossed
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

Recommended Use

Activity	Suitability
Daily Commuting	✔
Travel	✔
Cycling	✔
Hiking / Day Trips	✔
Kayaking / Boating	✔
Beach / Fishing	✔
Deep Diving	✘ — IPX7 covers immersion, not sustained depth

Quality Inspection Standards

Inspection Item	Standard
Fabric Inspection	100%
Weld Seam Inspection	100%
Airtight Zipper Test	100%
Full Water-Immersion Test (2+ hours)	Batch sampling
Strap, Buckle & 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, a batch immersion test and a signed golden-sample comparison. Third-party inspection (SGS / QIMA) is available on request.

Product Highlights

Feature	Advantage
Airtight Waterproof Zipper	True IPX7 sealing with full zip convenience
Welded Construction	No needle holes, so water has no path in
Minimalist Matte Shell	Retail-ready look for urban and outdoor channels alike
Sealed Side Pocket	Phone and wallet stay dry and reachable
Chevron Padded Back	Cushioned, ventilated carry at a full 24L
Four Stock Colourways	A full range to merchandise without extra tooling

Printing & Logo Options

Brand it your way: silk-screen, heat-transfer, rubber patch, welded patch and embossed logos, in stock or custom Pantone colours.

OEM / ODM and Wholesale

As the factory, we supply the SL-E641 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, zipper type, pocket layout, laptop sleeve and your logo, and we 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.

Need a deeper IPX8 rating with a laptop compartment? See our IPX8 airtight-zipper backpack. Prefer a classic roll-top? See our 20L / 28L roll-top waterproof backpack.

FAQ

How waterproof is it?

It is rated IPX7 with a genuine airtight waterproof zipper on a fully welded body, and every unit is verified with a full water-immersion test of more than two hours. It protects your gear through heavy rain, spray and brief immersion.

Is the zipper a real airtight zipper?

Yes — a sealed airtight zip track, not a coated coil zipper under a storm flap. That is what allows the IPX7 rating with a zip opening.

What colours are available?

Navy, cream, grey and green as standard, with custom Pantone colours available from MOQ.

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 the SL-E641 or start an OEM/ODM program, send us your colours, capacity, 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