This is the FitFighter 35lbs Steelhose: a fitness tool that replaces kettlebells, dumbbells, medicine balls, sledge, and sandbags. It has a flexible structure and can be used indoors and outside. It has deck handles, so you can use it for lifts, swings, and a lot more.
You can use the Steelhose for a while variety of moves. It has overhead, backpack, suitcase, pole vault, chop, and various other modes, so you can work your entire body. These are filled with fluid steel.