OXO Good Grips POP Square Food Storage Container 1L 5 "Good Grips POP Storage" Mrs STEVENS 21 July 2020 I am hooked on these POP storage containers. They are a little pricey, but so far are proving fully airtight. The seal is excellent and they look good. Please note that the lid can be pulled off if the contents are heavy and it is picked up by the lid (as my husband has a habit of doing!) - if used properly the POP lid works perfectly. The lid is also easy to clean and fits back together easily. They stack well and being square, I find them easier to pick up with my slightly arthritis fingers, than round containers.