The HAJKER is the optimal hiking day pack with a big 24L main compartment with a rolltop and an inner dry sack, waterproofing your gear for all kinds of weather. Store the stuff you need quick access to in the two zippered side pockets and compress it all together from the outside to get slimmer profile and a stable backpack that doesn’t bounce when you are out exploring, climbing, or running in the roughest terrain.The waist belt secures the lower part of the backpack and can also be detached and used on its own, like a hip-pack. You also got a helmet carry system that detachable and stored in a pocket when not in use. The pack also comes with an insulated water bladder pouch if you ever want to add a hydration bladder with the pack (bladder not included).