I have a related question: what kinds of things (that are likely to be in a survival kit) can't you carry on to an airplane. I know that in general, flammables and pressurized containers are among the items restricted. That certainly would describe matches and lighters, but It is hard for me to believe that a common pocket lighter would actually fail to clear security. Especially when smoking is still allowed on some flights (not many years ago on all flights). Does anybody know how lighters and matches are treated at airport security? It would be a bummer to be forced to give up your survival equipment unexpectedly when leaving on a trip.<br><br>Obviously large knives would also be a problem, but I believe knives with blades shorter than 4 inches in the US are allowed. And no need to mention firearms. Clearly not allowed in the cabin.<br><br>