Overview Gregory designed the TrailFlex suspension featured in the Gregory Stout backpack to provide exceptional support without excess weight. The suspension channels the pack load onto the lumbar region for comfort while on the trail and pre-curved shoulder harness straps and adjustable hipbelts provide a customized fit. A spring steel frame and flexible back panel provide adjustability while preventing the pack from barreling. With Solar Ready™ attachment clips that are specially designed for solar panels, the men’s Stout is available in 75, 65, 45 and 35 liter volumes and the women’s Amber is available in 70, 60, 44, and 34 liters. What Makes It Unique The larger Greagory Stout Backpack also includes the Sidetrak daypack, a combination hydration reservoir sleeve and ultralight daypack. Dual oversized hipbelt pockets also provide plenty of room to bring along your favorite point-and shoot camera and trail snacks and have them easily accessible on the trail. U-Zip access opens the pack for easy packing and the included rain cover provides protection when a storm sneaks up on you. Manufacturer: Gregory Mountain Products Product Name: Men's Stout and Women's Amber MSRP: Varies