Removeable tool pack. Molded goggle pocket with chamois. 7 Liter Hydrapak Included Compression Shoulder Straps The proven Nac Pak is redesigned for bigger days of riding with enhanced ergonomics to keep you going longer. With the perfect combination of cargo capacity, accessory carrying capacity, an included 3L hydration bladder, quick access and intelligent tool storage, the Nac Pak 3L Hydrapak is the bag riders continue to rely on. The Nac Pak carries your essentials for a full day outdoors or even a textbook and a small laptop for class.