Heavy Duty Dry Bag Dumbbell "DryBell" Waterproof Bag - Sand / Water Weight UNIQUELY DESIGNED DRY BAG FOR WEIGHT TRAINING while away from the gym FILL WITH SAND OR WATER - sand gives optimum results - if using water we suggest lining DryBell with garbage liner to facilitate quicker drying and reduce risk of leakage on swinging INTERNAL GRADUATIONS allow accurate weight measurement SOFTGRIP REMOVABLE HANDLE gives a comfortable weight lifting experience and no accidental unfastening of clasp PACKS DOWN SMALL for throwing in your backpack/suitcase or briefcase (weighs only 100g) but fill for any weight up to a 10kg/22pounds (water) or 16.5kg/36pounds (sand) weight