This is one of the original Crematoria harness & water-pouch back packs worn by Vin Diesel in the Chronicles of Riddick. This harness has slightly different details from the 'Hero' version and features a double strap across the back section to hold the rubber knives more securely during use. This harness is thought to have been used during a fight/stunt sequence or under the cloak at the start of the Escape scene where only the front straps and belts would be seen clearly on screen - from The Prop Store of London