If you have ever watched a prison movie one of the staple bartering items is cigarettes.  The Same will be true when the dollar collapses.  If your a smoker you might consider buying an extra pack each time so you got one to smoke and one for your preps.  Or even if your not a smoker buy a few packs for bartering.   Cigarettes can go stale eventually (more quickly once the pack is opened) but you could probably slow that down by putting them in an airtight container or vacuum pack. Post-SHTF scenario though, folks won’t care if they’re stale. You’ll want to put them in an airtight container anyway. Rodents go crazy over tobacco. It’s like catnip to them.