The Stuff Sack is made from a durable 70D Nylon and is the perfect solution for organized modular packing on any adventure. A white interior coating helps to shed moisture and makes finding your contents easy and the unique tear-proof drawcord top opening is a cinch to use. Available in three colors for optimum color coding and organization of your gear. These tough Nylon Stuff Sacks do not have taped seams or a roll-top closure; so they are water resistant rather than waterproof.