Patch Glue, 10g
Ten grams of Maruni vulcanizing cement in a tube about 3" long. Just the right size to go inside your little patch kit and replace the one in there that's probably all dried up (go check now). Maruni is a Japanese maker of glue and patches for everything from bicycle tires to giant heavy equipment tires. It's all they do. We're probably the only source for this in the country, but not the world.