When we last tested glass food storage containers, we recommended the OXO Good Grips 8 Cup Smart Seal Rectangle Container. But what if you do a lot of meal prep and need glass containers that can securely contain smaller quantities of food? OXO produces smaller sizes of our favorite glass container, so we rounded up the 7-cup round container, the 4-cup round container, the 3.5-cup rectangle container, the 2-cup round container, the 1.6-cup rectangle container, the 1-cup round container, and the 4-ounce rectangle container to see if they would perform as well. And since many meal preppers prefer to buy sets of matching containers, we also tested the 16-piece mixed shape, the 12-piece mixed shape, the 8-piece rectangular, and the 8-piece round container sets, all made by OXO.
Our goals were the same as when we tested the winning OXO 8-cup glass container: to find truly airtight, leakproof containers that resist stains and odors and can be used to store food in the refrigerator and freezer and reheat food in both the oven and microwave.
To see if all of these containers were airtight and leakproof, we first opened and closed their latches 25 times. Next, we submerged all the containers in water to see if they let any liquid in before filling them and vigorously shaking them to see if they let any liquid escape.