Two packing cubes, one big and one small, for everyone who opens their suitcase mid-trip and immediately regrets every decision they made while packing. The large one fits clothes, the small one fits everything else. They zip flat when empty so they don't take up space being annoying in your closet.
Honestly one of our favorite use cases is tossing your dirty clothes in on the way home so they don't mingle with the clean stuff. Not glamorous but genuinely useful. Set of two.