True to Arc'teryx's function-first design philosophy, the Arc'teryx Men's Bora AR 50 Backpack is capable of carrying everything you need for weekend escapes and multi-day outings in the backcountry. Perhaps its most notable feature, the RotoGlide hip belt moves up and down with your body as you climb hillsides and descend steep trails. As its name suggests, this hip belt glides smoothly along a track (by approximately 1. 25-inches). This small amount of movement prevents the hip belt from digging into your sides as you move along the trail. To ensure a plush, supportive fit, the shoulder straps use dual-density foam that won't pack-out like the single-density foam on cheaper packs. For separation of wet items and outerwear, the front kangaroo pocket partitions gear from the pack's main contents. Also, there's a handy top lid pocket with a separate map compartment on the underside. Both the front kangaroo and top lid feature waterproof AC2 nylon fabric, which prevents passing showers from soaking through and ruining sensitive items.