Osprey have really pushed the hydration market forward with their new Hydraform Reservoirs. Built with a solid backing to the bladder - these reservoirs are mega easy to slide in and out of a full pack. The solid structure also encourages consistent water pressure and therefore a more reliable flow of water on the move. They are also significantly more stable in the pack - any 'sloshing' around of liquid during strenuous activities is kept to a minimum.
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