I have been using Park Tool’s Glueless Patch Kit for the past 16 years. They have not let me down. Each pack contains 6 patches and a small piece of sand paper. They are very handy to keep in your pack, just in case you blow through that one tube you carry or when you end up helping out your riding buddy- the one who never carries a tube.
Just on my last ride I had a piece of metal puncture my tube and the tire. Now I knew if I pumped the tube back up, it would just pop again as the it worked itself through the tire.
Then I scuffed the tube and applied a patch to it as well.
I have had these patches on tubes for months and months at a time with no leaking. If you carry a pump and a tube you might as well carry a pack of Park GP-2 Glueless Patches. They only take up as much space as two stacked quarters.
We worked with 3M to produce a self adhesive tube patch that stretches, flexes, twists, and turns right along with the tube. No messy glue, no bulky packaging. Lightly roughen tube with the included sandpaper, clean, apply patch, and you’re ready to go. Six patches with sandpaper in a neat little carry along box.