To OM's point, we also take a nail clipper that has a nail file. I think I would argue it is more essential than the knife---since a toenail problem really can keep you from hiking. And we take a needle and thread in our sewing kit that can remove splinters...

Eyeglasses? that's an interesting one. So far I've never had a problem, but I can imagine! I guess that's where duct tape comes in! grin
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