put your lighters in a zip loc bag, then put that in another zip loc bag. also throw about 1/4 roll of toilet paper in there!!! I usually carry some sweets or chocolates (my one riding buddy is type 1 diabetic) just in case.
a 20' x 2" ratchet strap without the ratchet mechanism, rolled up so its just the strap and a hook.. takes very little space and is an amazing tow rope if needed.
for KTM guys: take spare torx bits!!!!!! big ones too like t45
as far as cases, a pelican 1400 case is near impossible to break and not overly expensive either. I carry a spare quart of engine oil in mine too. between a pelican case on the skid, a tool bag on the handlebar, and a bag on your back with the smaller/lighter tools, there is more than enough room to carry everything you need, and then some.
otherwise you guys seem to have it covered.