I use these containers during the week for meal prepping. They hold just the right amount of food (watching what I'm eating) and stack very nicely in the fridge! I bought 15 of them. Heavy duty glass, and great lids. No, they're not the "snap-on" lids... but I knew that before purchasing them. The lids do fit on them great though! I'm so glad I'm not ever going to use those plastic, melting kind of Rubbermaid ones again. Will definitely be back to buy more! Thanks Pyrex!!