I was very pleased with the quality of these Sterlite boxes...best of all, I liked the size... have organized all my art supplies (paint brushes, paints, markers, paper, rubber stamps, inks, embellishments, etc)... as well as my craft supplies... (papers, beads, yarns, ribbons, etc. etc.) They stack nicely, but not with a click...instead they nestle into a groove on the top of the box below, so when you need one, theyre easy to get to. A big dog or cat, however, could knock them over if you put them stacked on the floor. I keep mine on my drawing table and my cat has ignored them, so no worries there. Anyway, they are nice and see through, which I wanted, and the lids clamp nicely on. Overall, I am extremely happy with my purchase.