The Sea to Summit Lightweight Stuff Sack - 30L is made from durable 70D recycled Nylon and is the solution for organized modular packing on any adventure. A white interior coating helps to shed moisture and makes finding your contents easy. The unique tear-proof drawcord top with Capture Cord Lock opening is easy to use. This tough Nylon Stuff Sack does not have taped seams or a roll-top closure; so it's water-resistant rather than waterproof.