What is the difference between polyurethane- and vinyl-coated SealLine dry bags?

Our premium polyurethane-coated (aka, PVC-free) dry bags offer significantly greater puncture and abrasion resistance than vinyl-coated dry bags, while also being lighter weight. For example, our PVC-free dry bags weigh approximately 8-14 oz. less than our vinyl-coated dry bags. In addition, the PVC-free polyurethane coatings are less harmful to the environment than vinyl coatings.
 

Our vinyl-coated dry bags are economical and resistant to punctures, tears, and mildew. They remain pliable at low temperatures and resist cracking.