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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.

China or Vietnam: What the 2026 Tariff Rules Mean for Waterproof Bag Sourcing
Sealock manufactures waterproof bags in Dongguan, China and in Ho Chi Minh City, Vietnam. Almost every US buyer we speak to now opens with origin rather than product, and most are working from information that is out of date — the rules changed twice in 2026 alone. This guide sets out where things actually stand as of September 2026, why the China–Vietnam gap is narrower than it was, and the compliance test that decides whether a Vietnamese-made bag counts as Vietnamese. Tariff policy is moving quickly; treat this as a framework and confirm current rates for your HTS codes with your customs broker before committing.
2026-09-14
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Welded vs Sewn: How Waterproof Bags Are Really Made
Sealock is a waterproof bag manufacturer and OEM supplier running high-frequency welding and industrial sewing under one roof. Buyers routinely ask us to choose a side — is this a welded bag or a sewn bag? It's the wrong question, and the answer surprises people: almost every good waterproof bag is both. The shell is welded because welding seals. The harness, the load points and the internal structure are sewn because sewing carries. A factory that can only do one of those will compromise the half it can't do. This guide explains how each join actually works, what each cannot do, and how to read a supplier's construction claim.
2026-09-10
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Fly Fishing Slings & Packs 10–24L — Welded TPU, Airtight Zip | OEM
Sealock is a fly fishing bag manufacturer in China supplying OEM, ODM, and wholesale buyers worldwide. A fly fishing pack is the most constrained bag in outdoor gear, and the reason is worth stating precisely: the angler is standing in moving water — waterline halfway up the thigh, sometimes at the sternum — operating tippet spools, nippers, hemostats and fly boxes with cold, wet hands. The pack has to keep its contents above the water, present those tools to the hand without being taken off the body, and stay clear of the casting arc of a nine-foot rod. That set of constraints is why a fly fishing pack is not a daypack with extra D-rings.
2026-09-10
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IPX8 Waterproof Backpack Production Process
Sealock is an IPX8 waterproof backpack manufacturer and OEM supplier. Reaching IPX8 on a phone pouch is a precision problem on a small sealed volume. Reaching it on a 65-litre load-bearing backpack is a different discipline entirely: metres of seam instead of centimetres, a wide opening that has to seal evenly across its whole width, a body that flexes under load while submerged, and enough trapped air to put real pressure on the closure from the inside. This guide covers how an IPX8 pack is actually built, and the engineering numbers behind the closure that makes it possible.
2026-09-09
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Roll Top Waterproof Backpack Manufacturing Guide
Sealock is a roll-top waterproof backpack manufacturer and OEM supplier. On a dry sack, a roll-top is the simplest closure in outdoor gear — a round tube mouth folded down and clipped. On a backpack it is one of the most demanding components to build, because the opening is wide and shaped, it has to close cleanly against a harness and a frame, and its corners are where almost every roll-top failure begins. This guide covers how the collar is actually manufactured, the hardware decisions behind it, and the specification details that separate a roll-top that seals from one that merely folds.
2026-09-08
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Waterproof Backpack Capacity Guide for Buyers
Sealock is a waterproof backpack manufacturer and OEM supplier. Capacity looks like the simplest line in a specification and is one of the most misleading. A litre figure on a waterproof pack conceals three separate numbers: the volume as measured, the volume actually usable once the pack is sealed, and the weight a human can carry in it — and the third is the one that decides whether the product works. This guide covers how to specify capacity so the number on your listing means something to the customer.
2026-09-08
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