Punching Bags HART Sport Punching Bags HART Sport Punching Bags HART Sport HART Pro Jumbo Punch Bag 180cm Freestanding Punching Bag HS BB180S Hop sport.uk Store. The HART Pro Jumbo Punch Bags are an extra large diameter bag which means you have a larger hitting area and extra weight to reduce swing when punched or kicked. Foam lined for comfort and safety. Includes a heavy duty, 4 way hanging chain with swivel, plus added feature of tie down loops on bottom of bag (Tie down straps (6 158) can be purchased separately). Rag filled. Diameter: 42cm. Sizes available 120cm approx 46 48kg 150cm approx 60 62kg 180cm approx 70 75kg