Stripping down to an ultra-light alpine weight (620g.) when removing its interior H2Oproof liner, top lid, and hip-belt, the H2Oproof Trion Light 28 Backpack from Mammut offers mountaineering utility at lightning speed in a wafer weight. Fully equipped at 1,100 grams, this backpack boasts an adjustable Butterfly 5 mm aluminum frame for even weight distribution, super nice 2-layer, high-density EVA back padding, hip and shoulder belts with laminated stretch fabric cover, H2Oproof, removable inner liner to keep the entire load dry, roll-top closure, height-adjustable and removable lid, with H2Oproof tape, 2 lid pockets - external and internal, reinforced ski carrier, daisy chain gear carrier, 2 removable ice tool attachments, compression straps that can be tensioned at the side or the front, compatible hydration system, detachable hip belt. The Trion Light 28 provides optimum freedom during any challenging alpine ascent.