Safety pins and sewing kit, good idea. The bivy, I'll just have to try one and see. I don't think the reflective band is big enough, certainly not air visible. The safety vest is a sop to that. I'd rather have something like a bright orange sil tarp, something that'd be bigger but pack smaller, but never seen one.

I think the transpiration bags are essential, to be honest. I'm here in Texas, where there aren't that many creeks, and if I got stuck in the summer I'd be quickly in trouble. I've done the Hotter than Hell 100mi bike ride in 109 degree heat and finished in good order, and am confident that I'd want a lot of water. I really need to experiment with the transpiration bags to see how much water I'd get with them.