Features 400-denier polyester Our full-featured, women's-specific backpacking pack with ergoACTIV XP suspension maximizes comfort and stability, with room for full amenities ErgoACTIV XP suspension with Open-air back panel and Swing Arm shoulder straps Top-loading with floating top pocket, plus front zippered access and Waterproof taping on top and bottom Compartment divider, side and hip belt pockets, front and internal organizer pockets Retractable trekking pole/ice axe loop, sleeping pad straps, hydration compatible, Also available as men's-specific Mercury Description Product Description Product Description DECENT FEATURES of the Black Diamond Women's Onyx 55 Pack ErgoActiv XP suspension with OpenAir back panel Top-loading with floating top pocket, plus front zippered access Waterproof taping on top and bottom Compartment divider, side and hipbelt pockets, front and internal organizer pockets Retractable trekking pole/ice axe loop, sleeping pad straps, hydration compatible The SPECS Material: 400d polyester twill 420d nylon twill The SPECS for Small Volume: 3356 cubic inches / 55 liter Average Stock Weight: 4 lbs 8 oz / 2.06 kg The SPECS for Medium Volume: 3478 cubic inches / 57 liter Average Stock Weight: 4 lbs 9 oz / 2.10 kg From the Manufacturer A durable, full-featured women's-specific pack that maximizes comfort and stability during long days on the trail, the Black Diamond Women's Onyx 55 Backpack is ideal for weekend trips from Yosemite to the Ice Age Trail. Our ergoACTIV XP suspension system uses a custom, 3D pivoting hip belt, women's-specific fit and SwingArm shoulder straps for increased stability, unparalleled freedom of movement and dynamic load transfer. The pack's front zippered panel gives you full access to the inside, while multiple pockets, dividers and straps help secure and organize your gear during extended trips.