5mph Car Compactor!

Perhaps only for cars that are a bit older or are rated for higher speed crashes that don't crumple the bumper: If your car goes 5mph and weighs 3,000 lbs or more, I'm sure you could rig up some kind of contraption that used all that power to compact your trash/recycling/compost. It should be made of semi-rigid memory foam (like my Tempur-Pedic pillow). It could be suspended by cables at the back of your garage. You load up the "box" made of memory foam with your squishables and gently ram your car's bumper into it. Voila!