High Sierra AT606 26 -Inch Wheeled Backpack with Removable Daypack buckskin Capacity: 4150 cubic inches / 68 litres Main compartment has book-style opening, interior clothing hold-down straps. QUICK-CLIP buckle at the top of the removable day pack allows quick attachment to the main bag. Recessed, telescoping aircraft aluminum handle system with locking mechanism. Materials: 1680 Denier Duraweave, Metallic Mini-Weave, 900 Denier Duralite