Karrimor refuel 15 plus 2 hydration pack refuel 152 comes complete with 2 litre hydrapak bladder the rct back system keeps the bag compressed and under control when running biking or skiing 15 litre main compartment and helmet holder hydration pack capacity 152l back system refuel chassis technology contact mesh coolmesh pockets zip access to main compartment helmet holder hydration complete with hydropak 2l bladder fabric ks p450 weight 590g black