防水バッグ

How to Choose a Waterproof Bag

Three details decide whether a bag is genuinely waterproof: the fabric, the seams and the closure. PVC tarpaulin and TPU-laminated fabrics keep water out on their own, but a bag is only as good as its weakest seam, so stitched seams in the waterproof shell need to be welded or sealed. Roll-top closures are simple and reliable when rolled at least three times; airtight zippers give quicker access and can be rated for immersion. Match the rating to the use: IPX5 or IPX6 for rain and spray, IPX7 or IPX8 for submersion.

For brands, the next decisions are size range, carry system and finish. We help buyers build a range that covers entry, mid and upgraded price points without duplicating models.

Every order passes through incoming material inspection (IQC), in-process checks during welding and sewing (IPQC) and final inspection (OQC), with SGS or QIMA third-party inspection available on request. Our test programme covers seam tensile and bonding strength, load testing of 1,500+ cycles, zipper testing to 3,000 cycles, salt spray on hardware, abrasion, and colour fastness and colour difference against the approved sample. Waterproof ratings are verified on the bag itself: a heavy rain and water-jet test for IPX5 and IPX6 models and a full water-immersion test of 2+ hours for IPX7 and IPX8 models.

Frequently Asked Questions

What is the MOQ for custom waterproof bags?

Usually 300 pieces per style; some models start at 200 or 500. Colours can often be split within one order.

How much do custom waterproof bags cost?

Price depends on the material, size, closure, features, logo method and order quantity. Send us your specification or a reference sample and target quantity, and we will quote.

Can you add our logo and brand colours?

Yes. Screen printing, heat transfer and welded patches are the most common methods, and we can match Pantone colours for the fabric, webbing and zip pulls.

How long do samples and production take?

Samples usually take 7–15 days and bulk production 30–45 days after sample approval, from our factories in China or Vietnam.

Related guides: Welded vs sewn construction  |  What each certification proves  |  Logo methods that survive water