SLIM & LIGHTWEIGHT FOR RIDING MOTO ALL DAY.Because of the 10L cargo storage, the Moto Lite 1.5 is the perfect bag for those long rides where you may need to carry a waterproof coat should the weather change and some tools in case repairs are needed, also includes a 1.5L HydraPak bladder and bite valve. The feed tube can be used over the shoulders or under the arms, which ever you prefer, there is also a magnetic catcher, so you can reach the tube when needed. We have a new one size fits all harness system for the chest to ensure the bag stays in place and AirLine back ventilation ensures sweat is kept to a minimum.And one size fits all!If you are looking for a waterproof hydration bag with slightly less storage, check out the HydraDri WP 2.0.