News

Roll Top Waterproof Backpacks: Features and Manufacturing Advantages

Sealock manufactures roll top waterproof backpacks for OEM, wholesale, and private label buyers from factories in China and Vietnam. The roll-top has taken over the waterproof backpack category for a reason that is usually explained from the user's side — it seals better — but the more interesting h......

Waterproof Backpack Factory: Production and Quality Assurance

Sealock operates waterproof backpack factories in Dongguan, China and Ho Chi Minh City, Vietnam, producing OEM and wholesale packs for outdoor brands and importers. A waterproof backpack factory has to run two production disciplines at once — high-frequency welding for the waterproof body and indust......

Waterproof Backpack Supplier Selection Guide

Sealock is a waterproof backpack supplier and OEM manufacturer serving outdoor brands, importers, and private label programmes from factories in China and Vietnam. Choosing a waterproof backpack supplier is a different evaluation from sourcing a simple bag, because a waterproof backpack is a load-be......

Wholesale Waterproof Backpacks from China Manufacturers

Sealock supplies wholesale waterproof backpacks in bulk to importers, distributors, and retail buyers, shipping FOB from factories in China and Vietnam. Buying backpacks in bulk is harder than buying dry bags, because a backpack has more parts that can vary batch to batch — welds, zippers, straps, f......

Custom Waterproof Backpacks for Outdoor Brands

Sealock builds custom waterproof backpacks for outdoor brands, importers, and private label programmes — packs designed around a brand's market rather than pulled from a catalogue. A custom waterproof backpack is worth the investment only if it does something a generic pack does not: fit a defined c......

OEM Waterproof Backpacks: Custom Manufacturing Solutions

Sealock provides OEM waterproof backpack manufacturing for outdoor brands, importers, and private label programmes, building each pack to a brand's specification rather than selling a fixed catalogue item. An OEM waterproof backpack is engineered across seven core processes, and true customization m......

Welding the Hardest Part of a Dry Bag: The See-Through Window

DONGGUAN, China — [July], 2026 — A production run of see-through roll-top dry bags is moving through the high-frequency welding lines at Sealock (Dongguan Yifulong Outdoor Products Co., Ltd.) this week. Built for an overseas brand customer, the bags pair a black waterproof body with a clear front wi......

Waterproof Backpack Manufacturer for OEM and Private Label Projects

Sealock is a waterproof backpack manufacturer producing OEM and private label packs for outdoor brands, importers, and retail programmes. Sourcing a waterproof backpack is a harder brief than sourcing a dry bag, because the supplier has to be good at two different disciplines at once — waterproof co......

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