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Insights

We are glad to share with you about the results of our work, company news, and give you timely developments and personnel appointment and removal conditions.

Custom Dry Bag Production Guide
Sealock is a custom dry bag manufacturer and OEM supplier. Most sourcing guides stop at materials and minimums. This one goes onto the factory floor, because on a dry bag the production sequence is the product: a welded tube has no lining to hide a weak seam and no zipper to blame, so every decision about cutting tolerance, weld parameters, and the order operations run in shows up directly in whether the finished bag holds water. Understanding that sequence tells a buyer what to specify, what to ask to see, and where the real constraints on a custom design sit.
2026-08-21
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OEM Dry Bag Factory for Outdoor Brands
Sealock is an OEM dry bag factory in China supplying outdoor brands, paddlesports labels, and wholesale buyers worldwide. An outdoor brand rarely needs one dry bag — it needs a line: a small sack for a phone and wallet, a mid-size for a day on the water, a large one for a weekend, and usually a backpack version for the walk in. Building that line so it looks and performs like a family, at one waterproof standard, is what a welding factory is for. This guide covers how to structure a dry bag range, where to differentiate, and how the manufacturing side supports it.
2026-08-21
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Welded Dry Bags 2–100L — MOQ 200, CN & VN Origin | OEM Factory
Sealock is a dry bag manufacturer in China supplying OEM, ODM, and wholesale buyers worldwide. The dry bag is the oldest and simplest product in waterproof gear — a single welded chamber closed by rolling the top — and it remains the benchmark by which a waterproof factory is judged. There is nowhere to hide: no lining to disguise a bad seam, no zipper to blame. Either the welds hold and the closure seals, or the customer's sleeping bag comes out wet. This overview covers how a dry bag is built properly, what actually causes the failures buyers hear about, and the sourcing terms.
2026-08-20
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Waterproof Phone Pouch Material Guide for Buyers
Sealock is a waterproof phone pouch manufacturer and OEM supplier. A phone pouch is not made of one material — it's a body film, a transparent window, a gasket, and lock hardware, and each is chosen separately. Buyers usually ask "PVC or TPU?" as if that settles it, when the questions that actually decide the outcome are film thickness, clarity retention, gasket elasticity, and compliance. This guide covers each component, what the real trade-offs are, and where the commercial risk sits.
2026-08-20
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Will the Colour Come Off on Your Shirt?
DONGGUAN, China — [August], 2026 — Here's a complaint no factory wants to receive. The bag is fine. It's welded, it's sealed, it holds water out exactly as promised. The problem is the customer's white t-shirt, which now has a faint stripe of the bag's colour across the back — and the passenger seat of their car, which has a matching one.Colour transfer is a small failure with a long tail. It doesn't stop the product working, so it never shows up in a waterproof test or a load test, and it's almost never specified in a purchase order. It just quietly turns a good product into a returned one. The machine in this article exists to catch it before it ships.AATCC crockmeter in the Sealock in-house laboratory.The motorized crockmeter in Sealock's lab, with its controlled operating procedure posted at the machine.
2026-08-13
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The Number That Decides Whether a Weld Is Actually a Weld
DONGGUAN, China — [Month Day], 2026 — Everything this company builds rests on one claim: that two pieces of coated fabric, fused together by high-frequency welding, will behave as a single piece of material for the life of the product. Every dry bag, every cooler, every inflatable buoy is that claim repeated a few hundred times around a seam.It's a claim you can't verify by looking. A perfect weld and a marginal weld look identical from the outside — the difference only shows up months later, when the marginal one starts to peel apart in a customer's hands. Which is why the machine in this article exists, and why, of everything in our lab, it's the one that most directly measures whether our core process is working.It pulls the weld apart and tells you exactly how hard it had to try.
2026-08-13
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