Protocol Power Sandbag Adjustable up to 50lbs. (sand not included) 1200D Terylene construction Built to last and can be used for indoor AND outdoor training Reinforced zippers, snap closures, and webbing Easily adjust bag weight, 2 Sets of comfortable grips. Designed to accommodate athletes of all sizes 1-20 lb. and 3-10 lb. capacity inner sandbags with duel hook and loop closures --- 10 lb. and 50 lb. weight levels allow for exercise progression and versatility