Costco is known for its large variety of items.
Okay, and its food court.
But mostly its large variety of items.

They have a ton ofweird, random items, and they have an excellentreturn policy.
Among the more random items is flour.
What’s astounding is the size of Costco’s flour bags.

Otherwise, it can go rancid or taste stale even before going rancid, per this Reddit commenter.