This sleek pack (includes a 3 L Reservoir) features the Air comfort FlexLite System with a flexible frame, extremely low weight and three-sided ventilation. Also the new mesh hip fins provide extra secure fitting of the pack. If you need to take that little bit more with you, it has practical volume expansion options. Details: Aircomfort FlexLite back system easily adjustable chest strap fold-away helmet flap front pocket with zipped valuables pocket wet laundry compartment mesh side pockets3M reflectors at front, sides and back loop for safety light rain cover.