The difference between water-resistant and waterproof arises from the fabric. A water-resistant material is so tightly woven that water struggles to get through. ... A waterproof material, on the other hand, provides a complete barrier to water.

After your pack is dry, you can spray it down with the waterproofing spray, following the manufacturer's recommendations. Usually, you need to apply one or two coats of spray and then hang the bag to dry. Once the pack is dry, you can go through it and use the seam sealer to tape up all of the seams......

A Polyurethane Coated 4 Way Stretch Spandex Tricot Polyester that is 190+40 GSM - 85% Polyester, 15% Spandex. This wind and waterproof stretch fabric resembles a super thin neoprene with a very soft black polyurethane coating and an amazing amount of flex. This polyester 4 way stretch spandex is non......

As water-repellent materials usually do not contain any kind of membrane of compact coating, the so called breathability of these materials is in most cases better than the one in waterproof materials.