crescent wrench for sure, length of pull start cord, can of fix a flat? at least it's compressed air, master link for chain, chain breaker, i used to carry a 32 0z gatorade bottle of emergency gas... oil, wd-40 is quite useful... roll of duct tape, some bailing wire, multitool like leatherman, mcgyver kinda stuff, your objective isn't necessarily to do a professional repair, but to get home right? i once had to braid a pull start rope out of hay bailing twine i found... you're really only limited by how much stuff you actually want to carry