100% Nylon Simplified compressibility with a 2-strap, roll top closure, optimized for efficient pack organization. 100% Nylon, 40D Siliconized Diamond Ripstop With PU Coating & 100% Nylon Taffeta Water Resistant Ultralight Durable Semi-Translucent Simple 2 Strap Compression Design Roll-Top Closure Reinforced Bottom Designed for Ease of Packing OUTDOOR RESEARCH: We built a company from a feeling: the urge to get out. It's what drives us. Our tribe is devoted to exploring our outdoor passions and challenging ourselves in the mountains, water, and deserts of the planet we love so much.