I carry enough plus a very little bit more. I try not to hike where the tourists go for many reasons.

If my regular hiking companions were to not carry their share I'd accept that ONCE. And we'd have a talk. And if it didn't change we'd not be regular companions any more. That's the plus side to their not being relatives!

Once upon a time I decided to not hike anymore with a fellow who had gone on several outings with me and my other buddies but who scared me for his lack of awareness. He wasn't a full participant and couldn't save me if I needed help (couldn't even find the car when spot-checked!). He understood and later took some Sierra Club courses, worked up to Trip Leader, and then had to spend an unexpected night out. :-)

Only gear I've really loaned on the trail was in Rocky Mtn Nat'l Park when a solo individual from N. Carolina described being really confused on top of the tundra where he was doing cross-country camping zones. He'd left his compass at home. I loaned him mine because my buddy had his. (He mailed it back later)

unimogbert