The weight bag is a 70 kg heavy 'worm' filled with rubber granules. A 2-man training tool of 1.60 meters long that is widely used in bootcamp, survival and CrossTraining. GorillaGrip is the official dealer of the Compete Force brand.
The weight bag has straps all around for good grip. The zipper can be used to add or extract fill. There may be sand in it or special rubber granules. The rubber granules are not included but sold separately.