Valor Boxing VB-APB-42 Adjustable Heavy Punching Bag is a punching bag that is constructed of heavy duty vinyl for long term durability. The adjustable bladder bag allows you to adjust the weight from 45-80lbs (This was measured using play sand. Weight can vary dependent on material used to fill). This is covered by a high-density foam padding insert that absorbs hits. Four double stitched pattern patches offer extra security when the bag is hung. Filler/sand not included. Gender: unisex. Age Group: adult.