Muay Thai also known as Thai boxing and Kick Boxing Bags are longer and heavier than punch bags, beacuse you use your hands, feet, elbows and knees to attack the bag. The heavier bag gives the fighter more resistance in his training on the bag and helps develop power and strength. The heavy bags used in Thai boxing come in lots of shapes and sizes. Some of which are even long enough to touch the floor, which gives the ability to train leg kicks.