USWE Hajker 30 Carbon Black Winterpack This waterproof, lightweight, and bounce-free rolltop backpack is ideal for winter conditions. The No Dancing Monkey harness system is included with the Hacker 30. It is compressible, Thermo Cell insulated, and has a No Dancing Monkey harness system. During physical exertion, a stretchable chest strap expands, allowing for a tight and compliant fit. Ergonomic shoulder straps evenly distribute pack weight across the shoulders. Thermo Cell shoulder straps encapsulate heat from physical activity, preventing the drink tube from freezing even in the harshest winter conditions. Additional shoulder strap pockets are ideal for storing extra drinks, food, and gels. Features: Storage capacity of 30 liters The rolltop main compartment opening is waterproof, keeping your gear dry and safe. While in use, the multi-adjustable back panel allows for individual fit and pack sizing. The lower portion of the pack is secured by a detachable waist support belt. The waist support belt can also be used as a hip pack on its own. Back panel with excellent ventilation Hydration friendly (not included) Insulated bladder sleeve for carrying hydration packs (max. 3 liters) Compression system on the outside for a slim profile 2x water-resistant zippered side pockets 2x side pockets for quick stash Passport/ID pocket Waterproof and zippered Helmet carrying system (detachable stash carrier).