I've used IRIS products forever to organize and store many things. I was so impressed with these little boxes (clear only) that Im buying more and my friend asked about them because she wants some too.
I discovered that not only can they stack, but they will stand on the sides as well. These are also the perfect size to store so many items while organizing medical supplies, cord keepers, hair accessories, craft supplies, kits for children to use while traveling, sewing kits, kits of snacks for children, and adults. My friend thought it was a sandwich box.
Another thing I really like is the closure of the hinged lid. They snap down and won't open until you open it. They are not going to open unless you open it, unlike other items I've seen. And since it's hinged, you won't lose the lid, and it offers additional work area while the box is opened.