Of Subway Cars and Tupperware

There are two ways to store your Tupperware (by which I of course mean Zellers-brand plastic containers and old margarine tubs): Separate the bowls and lids, and stack them in such a way that maximizes the space available, so that you have as little air as possible taking up room in your Tupperware drawer; Keep the lids on and stack them one on top of the other. The first way seems like the smart way, which is why most people choose it. "I'm being efficient with space! Look how much stuff I can fit in here when I use my mad Tetris skills!" and that's all fine and dandy, until you actually need to put away the leftover pasta and then you're all, "Where is the effing lid? Why can't I find the effing lid? STOP TELLING ME TO CALM DOWN" I choose the second option because I don't need to be able to fit millions of plastic containers into one spot; I just need about 10 of them, and I need to not have to sift through 18 lids trying to fi...