Insights

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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.

What Drives the Cost of a Waterproof Bag — A Real Breakdown
Sealock is a waterproof bag manufacturer and OEM supplier. Buyers comparing quotes are usually working from cost guides written about conventional sewn bags, and then wondering why a welded waterproof bag prices differently. The published breakdowns are broadly accurate for sewn production — they just don't describe this product. Welded construction moves cost between the buckets, adds one the sewn world doesn't have, and changes what happens when something goes wrong on the line. This guide sets out both structures, so you can read a quotation properly and know which levers actually move it.
2026-09-22
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Compression Bag Materials — Barrier, Flex-Crack, Weldability
Sealock is a vacuum compression bag manufacturer and OEM supplier. Material selection for this product is governed by a fact most specifications never acknowledge: every flexible material is permeable to gas. All flexible packaging provides a barrier — some materials just provide a better one than others. No compression bag holds a vacuum forever; the engineering question is the rate, and how that rate survives being folded, creased and stored for a season. This guide covers the three properties that actually decide a compression bag material, and why they pull against each other.
2026-09-21
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Custom Vacuum Compression Bag Production — Welded TPU
Sealock is a custom vacuum compression bag manufacturer and OEM supplier. A waterproof bag has to keep water out for as long as it is in the water. A compression bag has to keep air out continuously, for weeks, against a pressure differential that never relaxes. Air molecules are far smaller than water droplets and a vacuum never stops pulling, which makes this the most demanding sealing problem in our range. This guide covers how these bags are actually built — the valve, the closure, the pump integration, and the inflation test that catches what nothing else does.
2026-09-21
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Every Bag Gets Inflated Before It Ships: Air-Leak Testing on an IPX7 Welded Travel Bag Run
Walk past the test area on our Dongguan floor this month and the first thing you see is a waist-high pile of black bags blown up like balloons, each one taut, each one with a small grey valve on the face. An operator sits beside them with an air gun, working through a stack of flat bags on the floor and adding to the pile.
2026-09-17
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OEM Vacuum Compression Bags — Welded, MOQ 300 | CN & VN
Sealock is an OEM vacuum compression bag manufacturer and supplier. Before specifying one, there is a question worth answering honestly, because it determines whether the product succeeds for your customer at all: is your buyer constrained by volume, or by weight? Compression bags solve one of those problems completely and the other not at all. This guide covers that distinction, where vacuum bags genuinely beat the alternatives, which buyer segments they suit, and how the specification should change for each.
2026-09-17
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Vacuum Compression Bags — Welded TPU, 60–70% Volume Cut
Sealock is a vacuum compression bag manufacturer and OEM supplier. This category has one defining failure, and every buyer considering it should understand exactly where it happens. Marketplace reviews for conventional compression bags return the same complaint over and over: the bag loses its vacuum. Not in a year — overnight, within hours, or after a few days. Some buyers report never having a bag stay deflated more than a few days; others report leaks they cannot even locate. This guide explains why that happens, and what a welded TPU construction changes about it.
2026-09-16
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