Get the Rubbermaid Brilliance ones.

The Rubbermaid Brilliance stackable food containers are the best stackable lunch box sets for organizing multiple meals in a fridge. They do what you actually need: stack without tipping, seal without leaking, and stay transparent so you can see what’s inside instead of playing fridge roulette.

The trick is the lid. It latches on all four sides and has a little steam-release vent for reheating, but the real win is that the lids are recessed and non-slip, so the containers sit on each other without sliding off. That matters when you’ve got four stacked meals and you’re grabbing one from the middle. They’re also genuinely leakproof — I’ve carried soups and curry in them without drama.

They come in glass and plastic versions. Glass is better for full meals you’ll reheat and for keeping smells out. The plastic ones are lighter if you’re carrying them around all day, but they can stain with tomato sauce. Both are dishwasher safe. If you want a cheaper plastic option, Sistema makes good stackable tubs, but the lids aren’t as reliable under pressure.

The only real downside is price — these cost more than the random brittle Tupperware you’ve got in a drawer. But when the alternative is a fridge full of crooked towers that fall over every time you open the door, it’s worth it.

Get the 3.2-cup and 5.2-cup sizes as a starter set. That covers lunch and dinner, and they stack like bricks.