The Caldwell Hydrosled Shooting Rest holds up to 50lbs of media. There is 3.5 of horizontal gun fit adjustment to accomodate most rifles and shotguns, accomodates most detachable magazine rifles and lever action rifles. Features a rack and pinion elevation ram for precise adjustments, fine windage and elevation adjustments, elastic front retention strap to reduce muzzle jump and advanced rear recoil absorbing pad protects firearm and shooter. Easy portability when empty. Weight capacity of fillable reservoir- dry weight 16lbs, water added 35lbs, dry sand 45lbs and pebbles 60lbs.