Camelbak introduced the world to the hydration pack, and the company is arguably still the first choice for hydration on the go. The M.U.L.E. is a firm favourite here at BM Towers, combining a 3L bladder with a huge 9L stowage capacity, all spilt into several handy compartments making finding that energy gel easy. The current version has been updated with a water-resistant MP3 pocket so you can listen to all your favourite Christmas tunes on the move or, or not.