if i may, halfords sell an own brand hydration systems, for £40 you can get a 2lt pack with detatchable backpack (hydration only for short rides, both packs for longer stints), alot of storage, alot of pockets, helmet pouch, extendable waterproof cover. its well ventilated, no sweaty back. use one myself, it does more then most camelbacks, and for a lower price.