Waterproof means sealed, not just treated. Everything here has a bonded film or a silicone coating that water can't pass through, which is what you want for dry bags, pack liners, tarps, and shelters where a soaking is a failure rather than an inconvenience.
Worth knowing: the fabric is only half the job. Needle holes leak, so any seam that has to stay dry needs taping or seam sealer, and openings need a roll-top or a waterproof zipper.
Sold by the half yard and cut continuously, shipped across Canada and worldwide. If your build only needs to shed rain rather than stay sealed, see water-resistant fabric.
