Features 150D Nylon Rain Dobby / 315D Cordura Men's backpack for day hikes or minimalist overnight trips Fulcrum suspension system mimics skeletal system for balance and comfort Articulating waist belt keeps load centered; trekking pole loops Hydration-ready (reservoir sold separately); large front pocket Integrated bottle opener; available in small/medium and medium/large sizes Description Product Description Product Description Intended Use: Overnight, Lightweight backpacking Amazon.com Sized right for day hikes or minimalist overnight trips, the Sierra Herald 30 pack has the fit and features to keep you comfortable over the long haul. The Herald 30 is equipped with Sierra's Fulcrum suspension system, a molded composite frame sheet with a single DAC aluminum stay and a custom forged pivot at the waist belt. Drawing inspiration from the human skeletal system, the single stay mimics the human spine while the partial frame sheet corresponds to the shoulder blades and pelvis. The stay also rotates with your body, helping keep the pack weight close to your center of gravity. This improves your balance, provides superior support, and encourages a generous range of motion. Plus, the articulating waist belt keeps the load centered for increased stability while hiking. Storage-wise, the panel-loading pack is hydration-ready (reservoir sold separately), and includes trekking pole loops, a large front pocket with organization, waist-belt pockets, and water bottle pockets. The pack even includes an integrated bottle opener for post-hike refreshments. Other features include side compression straps, a molded back panel, dedicated ventilation channels, and die-cut foam shoulder straps. Small/Medium Specifications: Capacity: 1,750 cubic inches/30 liters Torso fit range: 16 to 18.5 inches Weight: 3 pounds 1 ounce Medium/Large Specifications: Capacity: 1,850 cubic inches/30 liters Torso fit range: 18 to 20.5 inches Weight: 3 pounds 2 ounces About Sierra Designs Sierra Designs has been one of the most renowned outdoor brands in the industry since 1965. Not only are Sierra's products reliable enough to help thrill seekers like Eric Larsen summit Mt. Everest and journey to both the North and South Poles, but they promote a harmonious relationship with the environment we play in as well. The editors of Outside Magazine, National Geographic, and Backpacker Magazine have all presented Sierra with numerous gear awards. Sierra is headquartered in Boulder, Colorado.