Food...
I too carry alot of "worst case scenario" redundant (but light as possible) things when I go out, because you just literally never know when you're going to go for a hike in June and round a corner into winter. I have used things I would never have expected to use at odd times - emergency bivy for a wind-break during a snack break on a day that was warm and still at the trailhead, but very cold and windy at the turn-around point. Don't sweat carrying a little extra... where you hike, it could someday make a difference for you or for someone you're hiking with.
MNS
Couldn't agree with you more........
When bc skiing I have had more people borrow my knife, baling wire to repair their broken bindings, power bar when bonking on the ski back, etc...........
I seem to lend people shells, or insulated jackets........
Also, I am sort of belts and suspenders kind of person professionally and personally. I try to prepare for second and third option scenarios.......planning ahead...........
Adds a couple of pounds-I would never be an ultralighter............but I feel better....