The Jack Wolfskin Proton 18 Backpack is a great choice for storing your essentials as you commute to work on your bicycle. Featuring a spacious main compartment with a large inner pocket which doubles as a stow pouch for water bladder. Also coming with four elasticated stash pouches, zipped front pocket with key clip and two elasticated mesh side pockets. Equipped for hydration system (tube duct and fastener). Integrated rain cover in base compartment. LED illumination by OSRAM, powered by a power bank (not included). Adjustable and detachable waist belt. Adjustable sternum strap with SOS whistle. ACS TIGHT: flexible, full-contact back system with body-hugging fit and outstanding ventilation. Capacity: 18 Lit. Dimensions: 48 x 24 x 20 cm. Colour: Yellow Material: 100% Polyester Code: 2007971-3055