2 Available. The Osprey Ultralight Pack Liner is a crucial accessory for backpackers seeking to protect their gear from the elements. Designed to fit backpacks ranging from 70 to 100 liters, this liner is constructed from high-tenacity 40D Nylon Ripstop for a balance of durability and minimal weight. It features a waterproof roll-top closure and fully taped seams to provide a reliable barrier against moisture. The rectangular shape is specifically engineered for efficient packing inside large rucksacks, ensuring maximum space utilization. Technical Specifications: Weight: 150g; Material: 40D Nylon Ripstop; Capacity: 70-100L; Key Features: Waterproof roll-top closure, taped seams, and lightweight rectangular design.