I love all the replies so far

It's interesting to see what is a "must have" for one person is something completely irrelevant to another. I do think it also really matters what, where, and how you ride: a road racer isn't going to need the same stuff that a mountain biker will. And someone that does extremely long endurance-type rides into very remote/uninhabited country isn't going to need the same as someone who rides in very urban/suburban environments.

The idea is to see what everyone needs and then take into consideration your own needs For someone like me, who is just really starting out riding at any real length, it's great to look through these and say, "Hmm. I never would have thought of that, that is a great idea!" or "Hmm, I don't think I'd ever need that because it just doesn't apply to the way/place/length I ride."

IMO, the most important thing you can carry is an ID and a cellphone. The ID in case you get hurt, and the cellphone because it means help is just a call away

Thanks for a really great thread