Upon receiving my OXO Good Grips Smart Seal Glass 3.5 cup container, it was immediately apparent that this is a high-quality and durable item. It is constructed of heavy-duty borosilicate glass and comes with a cover that seals tightly and securely fastens on all four sides, thus eliminating the possibility of leaks or spills.  An added bonus is that the cover is very easy to open and close.
We will be using this container for refrigerator storage and for reheating leftovers in the microwave. I have been searching for a while for high-quality glass containers to replace my old worn-out plastic containers and will definitely be purchasing more of these containers soon.