
Here's the tip part: Carry Park Tool TB-2 Emergency Tire Boots. These little thick plastic stickers go inside and keep the tube from pushing through. You still get a bump, but it beats sitting on the roadside. Sure, a dollar bill or Cliff Bar wrapper might work, but these Park things are the perfect size, they are thick enough to hold up better, and the sticky side helps keep them in place. I've used bills and wrappers in the past and had the tube push them out of the rip to the point the tube ripped again. That doesn't happen with these stickers.
We had to make use of two of these little suckers during our two-week tour and we were ever so glad to have them. If you ride roads out of cell range, or far from high use roads (think Calaveras Road) you need these in your seat bag. Really.