Arc'teryx Men's Velaro 35 Backpack 22" high 12" wide AC2 (Advanced Composite Construction) main compartment with sealed seams for complete weather protection Large, quick access N420P-HT fabric front pocket AeroForm monofilament mesh and Spacermesh in shoulder straps and hipbelt for comfort and ventilation Comfortable padded hipbelt Hydration bladder compatible with dual Hydroports for left or right handed tube passage