This shows the value of carrying a high quality knife, preferably with a blade length of at least 4 inches, just in case you pin your arm in a tight (tree) crotch and can't start your chain saw to cut it off. Your knife needs to be either a fixed blade or a folder that can be opened with one hand. Try to avoid buying knives with blades made of 420 or 440 steel. Get quality steel like D2 or S30V.
Hmmm, I forgot, most of us also carry Silkys. Forget what I said about knives.