I keep mine in a zip-lock bag. Not ingenious, but it works. I used to just keep them in a plastic container but I got tired of always trying to find room for it. With the bag, it lays flat in a drawer.
"Treat everyone with politeness,even those who are rude to you - not because they are nice, but because you are."
In the days before Zip-Lock bags and specialized Tupperware Cool-Aid storage containers - Mom had a couple of methods that I remember. One was called a rubber band - she would wrap a rubber band around several packs and toss them in the drawer. The other was the little box that berries came in ... like what a pint of strawberries came in. She just washed and dried them and then stacked the Cool-Aid packs in them and put them on the shelf in the cabinet.
"It ain't what you don't know that gets you in trouble. It's what you know for sure that just ain't so." - Mark Twain