Improved load-bearing equipment. Manually operated, lightweight purge valve with 1000lb crush rating makes compression simple and effective. 56 liter pack liner has thicker coatings and a safety orange interior for added visibility and use as an emergency signal panel and the 65L has the green interior. Proprietary and incredibly durable lightweight fabrics and coatings (210D High-Tenacity polyurethane coated Oxford Nylon. Dry Seal dual-strip roll-down closure. Weight: 357 grams/12.6oz Dimensions: 33x66 cm/13x26 inches Volume: 56 liters/3417 cubic inches