Shaped to fit seamlessly with your pack, the Ultralight Pack Liner is designed to protect the gear you carry inside your pack from the weather outside, giving you extra peace of mind in wet and rainy conditions. This product has a sustainable design with bluesignA(R) approved main body fabrics and GRS-certified 100% recycled main body fabrics. All DWR treatments made without PFAS. Features Roll-top waterproof closure Waterproof-coated fabric and seams Rectangular shape for efficient packing Specs Sizing: Small: fits 30-50L packs Medium: fits 50-70L packs Large: fits 70-100L packs Weight: Small: 0.201 lbs Medium: 0.256 lbs Large: 0.335 lbs