As probably already mentioned, things like salt, pepper, various spices really. Alcohol too. Its probably a good idea to constantly ask yourself, "What am I lacking in ability or possession?" If the SHTF hard enough, there is honestly very little if anything I'd "need" from anyone. Granted there are some key "items" I'd keep eyes open for if such an occurance took place that could potentially assist in building a sort of wasteland empire, but won't get into that on here lol.
Badger