Given how much interest there is around knowing each others' bulk buying habits, R's multi-pack-management hack seems well-timed:
I shop every week at a warehouse club and frequently stock up on multi-packs of items I will use over several months, such as three large bottles of catsup or three boxes of coffee filters. Many times, I've bought a three-pack of something, only to find a package or two from the previous purchase that was hidden at the back of the cabinet.
I now use a Sharpie to number the individual items when I bring them home so
a) I know if I have any left that may be hidden, and
b) I know when I need to add that item to the shopping list.
Such a simple way to solve a frustrating (and expensive) problem! Amazon Subscribe & Save users: take note.
Any other tricks for keeping track of, storing, or managing bulk purchases?