This pack was designed for mountain climbers. Hyperlite Mountain Gear packs are known for being lightweight, durable, seam-sealed and nearly waterproof, streamlined, comfortable, and for their use of various DyneemaA(R) fabrics. Details Roll-top design with vertical compression straps Proprietary Seam Sealing No Frills Main Compartment 100% Waterproof DyeemaA(R) Composite Fabric Padded Hipbelt with Gear Loops Padded Shoulder Straps Adjustable Elasticized Sternum Strap with Whistle Crampon and Ice Axe Attachment System Four External Daisy Chains 1/4" Foam Back Panel Internal Plastic Frame Sheet Removable Aluminum Stays Side Compression Straps Y-Strap Top Compression 4400 cu in (70 liters) 2.3 lbs (1047 g)