rubber liners that are meant to line the drawers of toolbox or kitchen . i also cut 4 wedges out of some wood look like big doorstops, stuck some velcro on one of the 90 degree sides . i use the 4 wedges to block in what ever im transporting . works great for bbq propane tanks . im still learning how to use a computer lol so once i figure out how to get all the pics off my phone ill post some of the wedges and the whip