I use plastic stackable baskets that are designed as in-trays for kids
. They have plastic rods to separate them, but I never use them, just put heavy things (soft drinks) in the bottom basket, Tupperware on the second basket, and soft things like cheese and salad on the top basket. Then of course, I put a few softies down the small gap at the side so I don't have to lift
the top and middle baskets out every time I get thirsty! There's also space down the side for milk bottles with frozen water
in them, which helps keep fridge colder.