The convenience of external fill in a sleek bike pack the 2l crux reservoir can be refilled on the fly via the quick release flap on the front of the pack two external pockets for small items like keys wallet phone or storage for a shed layer camelbak have also added reflective accents to keep you visible on early morning and evening ridespack only weight 230g 0lb 8oztorso fit range 38 53cm 15 21infabric 200d polyester plain weavefeatures the brand new crux delivers 20 more water