These are very high quality and snap to create an air tight seal. They are very sturdy and thick. These are just as great as some of the pricier name brand containers I have in my cabinets.

I really like these for a lot of reasons. We've been ditching our Tupperware, Ziploc and Rubbermaid containers in favor of glass Snap-lock containers. These are the perfect size. Pros: Leak proof. They seal tight. We can dishwash the lids because our dishwasher doesn't have a heating element. We got no warping even when sanitizing. I realize in the long run the silicon seals may suffer but I have not run into that yet. The borosilicate glass is perfect for oven, microwave or freezer. Cons: The silicon seals are not affixed to the lids so they pop out in the wash. Not a huge deal at all. It would be even cooler if the manufacturer offered replacement seals if you needed them. No markings on the glass to indicate capacity, or with what they are safe - (freezer, oven, microwave). I may know from my purchase, but if this get handed down or gifted, there is no information for someone to know what these can or cannot do. All in all, they work great. It's become common and bothersome that manufacturers in China are not marking their dishware with any symbols.

These are a great size (a little larger than the snapware containers I already own), and the lids have a nice, snug fit. I'll update if they start to wear out!

These containers are large enough for a good-sized lunch, or even to store leftovers. The glass is awesome and very solid. The lids fit on well and the seal keeps everything in - or out, depending on which way you look at it. The glass containers are dishwasher safe, but the lids are not. Keep that in mind.