I think Lightfighter is THE place to look.
Add:
a Magellan GPS
GOOD gloves
Zip (wire) ties
Socks - Smartwool - I've personally found these to way outperform Thorlo's
Foam ear plugs to make sleeping easier...
Goldbond or baby powder
GOOD boots - Danner, Wellco, etc TRY THEM ON. I've had the same model and size fit slightly differently.
Sewing kit - make a good one yourself - an altoids size filled with "Craft and Button thread" and nylon upholstery thread can really help.