Granite Gear - Lutsen 55L Refit Backpack The Granite Gear Lutsen 55 is a versatile trekking backpack designed for multi-day backpacking trips. It features the proprietary Refit system, allowing for torso length and hip belt adjustments to accommodate various body types. The pack utilizes the A.C. (Air Current) suspension frame, which is designed to provide effective load transfer and ventilation. It includes a zippered sleeping bag compartment, large stretch mesh side pockets, and a top-loading main compartment with a floating lid. The construction incorporates high-tenacity nylon fabrics for durability in backcountry environments.