Rubber Inner tubes. As kids, we loved them. We spent hours playing with them. But where are they now? They’ve all but disappeared, and no one has looked to improve upon them. Today’s cheap, plastic inflatables have replaced the classic rubber tube, but with limited success. Vinyl/PVC plastic tubes lack durability, are hard to inflate, and seldom last more than a few hours before they burst. Most are very toxic, are a huge waste of money, and continue to pile up in our landfills.