I don’t have one in every under saddle bag but I do have two “Gerber CoolTools” (the one with an adjustable wrench, hex keys, socket wrenches AND integral chain tool). They don’t seem to be in current production but saw a few on EBay. I’ll concede that the need for a chain tool is pretty unlikely and even tho I have the capability, if I have a chain issue, I’m much more likely to reach for my cell phone!