A man on the street named Monty here in Azusa was sporting this homemade back-mounted toolbox and pushing a homemade cart, which I found less interesting. This backpack, being made of plastic, must be oiled on occasion to retard the California sun's ravages on its composition. The body-side of the pack is padded with some kind of soft rubber. He carries hammers and other hard or sharp objects in it. Interesting bit of insane ingenuity, no? Is there anything like this that is mass-produced? Holla if you know.