I bring stuff I hope I'll never use. First aid kit. Duct tape. Ibuprofin. Usually it's dead weight but when you need it, you need it.

I'll have to go over my gear list for exact figures but I do know this: My freakin bear canister alone will be about 13% (ignore my sig line on this one) of my base weight this summer on the JMT. Yes, I know it's a necessary evil but that doesn't make the math any easier to accept LOL!!!!