Century 6ft Muay Thai Heavy Punch Bag. Century's biggest heavy bag ever! Being over two feet longer than the original vinyl heavy bag, this bag has a 42-1/2 circumference to create more hitting surface for improved training. Comes with 1 year guarantee.2007 is the UK's Highest Rated Combat Sports Store with over 5000+ Verified Reviews on our website. Choose from thousands of products for Boxing, Jiu Jitsu, MMA, Muay Thai and more.