Biketek Hydration Pack. This Biketek hydration pack is a complete drinks system for use whilst on the move, perfect for green-laning, trail and road riding. The robust backpack features a well-sized main compartment with internal key pocket and a further 3 outer zip pockets, and MP3 headphone port. The 2 litre drinks bladder locates in a separate external section, with drinking-tube retainers on the shoulder straps. External bungee and quick release of spare clothing and luggage. Fully padded shoulder straps and back support, with chest and waist belts for snug fitment.