I agree. Clif bars are on my list. Have carried the same one in my travel luggage (always travel with small found stash and a few bottles of water) for a couple years until one day I decided I should just eat it and put a new one in the bag. It seemed unaffected for being kicked around all that time and tasted fine. I think in the future I'll find a nice sized plastic container for my snack, instant food & beverage stash.
I bet a small kit packed into a small insulated cooler could weather the trunk nicely for at least a year or so.
--KW