The Jack Wolfskin Ham Rock 16 back pack Main compartment with inside pocket, a flexible front pocket with key clip & 2 mesh pockets provide extensive and organised storage space. It’s equipped with a helmet attachment, a rain cover, bicycle pump/bottle holder & a trekking pole lashing option. A fixture for a drinks bladder & an organizer compartment. With its full-contact suspension system, it fits close to the back, so you can enjoy more freedom of movement. Very good ventilation is guaranteed via the central ventilation channel, the air-permeable back cushioning & the breathable mesh coverings. It has a fixture for a drinks bladder, with enough room in the front pocket, which will come in handy on a hot summers day.