Currently, all Bad Ass Work Bags are water resistant, but not waterproof. The vinyl is indeed 100% waterproof, but during the sewing process holes are punctured in the material resulting in a leak path for water. With that said, we take every effort to maximize the water resistance of our products (ie. We roll the edges before sewing to ensure the tightest seal possible, the flip-top bag has a hurricane flap that protects the zipper area from water ingress, the standard bag has a Velcro strip to protect its zipper). I’ve personally used my bag in the rain on the back of a crew boat heading out to platforms out in the Gulf of Mexico with no issues. However, we have had reports of bags getting wet in heavy rains in the bed of trucks. We hypothesize that this is because the bag is sitting in standing water and has time to absorb.