DING DING DING!! We have a winner!!
Nuclear Waste removal is exactly what these carry. Each of these giant bins are steel & concrete (mostly concrete) are like 3' thick and the actual cylinder that holds the nuclear waste is a little bit bigger than a thermos. If I remember correctly (when one of brought to my college a few years ago), it's 100% bullet proof (the people who brought them shot up one of them with a 12gauge shotgun w/slugs, a 44mag pistol, and a .232 rifle), and only carts around like 1lb of nuclear waste. These puppies are on their way down to Carlsbad/Hobbs, NM, where they'll be placed in the salt flat caverns, which are giant natural salt caves.
(Could you imagine how much nachos you could make if these were Velveeta? Wow!)