I bought a set of 2 x 180ml and 1 x 300 ml interlocking containers for my fridge. It is essential to buy a mix of sizes to fit into the various heights of fridge shelves as well as the door pockets. Due diligence must be paid while ordering as the size of the base varies across various ml containers. Also you need to note the height of your fridge shelves and door pockets. After you note the sizes on a paper then you just breeze along and order a few sizes and wait for your order. The service is excellent and if you find any misfitting sizes you just tell them and they oblige by taking back the order and sending you the replacements. All in all, a very pleasant experience.