Sometimes you don't realize your behavior is actually compensating for a design flaw. That is, until you see the solution. When borrowing a car and carrying anything heavy or delicate—a full toolbox, a few bottles of booze, a birthday cake—I always place it in the rear seat footwell. It would be much more convenient to load into the hatch, but I don't want those things sliding around because I took the corner too hard after watching Fast & Furious 6.
That's where the Stayhold comes in. The Velcro strip on the bottom adheres it firmly to the carpeting inside your car, allowing you to wall things off against the edges or build your own little fort.
As humble as this device is, to me it represents the ideal of what industrial design has to offer: It's simple, largely monomaterial, addresses a valid need, and is relatively inexpensive. Sure it's not going to wind up in the MoMA, but then again, neither is anything in the trunk of my car.
The Stayhold comes to you from Ireland, from "a little industrial design studio in Dublin," and runs $12.99 a pop.