I have all kinds of glass and plastic food storage containers I've bought or someone has given me, and these are my favorites by far. I'm trying to save money by cooking more and freezing leftovers. We don't have a separate freezer, so there's not a ton of room. These sizes are great, and the *shape* is perfect for stacking and stuffing your fridge or freezer. I have round Pyrex containers that are good, too, but they don't make the best use of space. These are exactly what I was looking for. The leak-proof (and vented) lids are a nice bonus. World Kitchen's service was good, and they had the best price online. I would not pay full price for these, but they're a great deal on sale!