Do we do cross country running? rock climbing or just a quick walk in the mountains The Mammut Lithium 15L backpack will help us shift into higher gears thanks to its faster and lighter design. Well-ventilated back panel keeps you cool and comfortable while running and the built-in, removable rain cover protects our equipment in difficult times during a passing downpour. Zippered main compartment and large front pocket hold everything what do we need to spend a day on the rocks side compression straps and hydration compatible design help us adapt to long day hikes.