The lids really do snap together easily. And then you can snap the base of the containers to the top of the lids. Never again will you have to go searching for the correct lid for the container you just poured the leftovers into.
They come in a wide variety of sizes. I like the tiny ones for leftover salad dressing or the remainder of a small can of hot peppers.
If you have a smaller kitchen and really need to stay on top of your clutter, the Rubbermaid easy find lids containers will make you breathe a sigh of relief. You'll be able to stack a lot of containers with their lids into the larger containers on top of their lids.
I really like the fact that these plastic containers are BPA-free, and they can go from freezer to microwave to dishwasher safely. Plus they are made in the USA.