The Marvel Avengers Bop Bag is action-packed fun that encourages exercise, helps kids burn off energy and provides an important break from screen time. The bop bag can also help kids learn to appropriately release anger and frustrations. Features bold, colorful graphics of Marvel Avengers characters. This bag has a weighted base that can be filled with water or sand for exciting bounce-back action. The bop bag is made with heavy-duty vinyl material for strength and durability. The single-direction inflation valve makes for quick inflation with any hand or foot pump (not included). Marvel Avengers Bop Bag is 42 inches high, 12 inches diameter when fully inflated. Recommended for ages 4 and above. Once inflated, the bop bag is sensitive to cool temperatures. If stored in a cool area or used outside in cool temperatures, bop bag may need additional air. Includes 1 patch kit.