Flat and rectangular beats tall and round

Flat, rectangular containers are the only sensible choice for a mini fridge.

Mini fridges are designed by sadists. There’s a freezer hump in the back, rounded corners on every wall, and a shelf that’s somehow both too deep and too shallow. Tall containers or round bowls waste the one thing you have the least of: vertical clearance. A flat rectangle slides onto the shelf, leaves the space above it open, and actually uses the corners instead of leaving doughnut holes of dead air.

Before you buy anything, measure the depth of the shelf from front to back, not side to side. That back hump eats a good third of your usable space. Then look for containers that match that depth. Cheap glasslock-style rectangles or flat bento boxes are perfect because they stack cleanly. And if you’re carrying instead of storing, a soft-sided lunch bag with a flat profile can squish into gaps a hard cooler never will.

Skip the insulated steel “adventure” jars. They’re tall, heavy, and they’ll sit there mocking you every time you close the fridge door into them.

A tape measure costs less than one fancy lunch box and will save you a month of fridge Tetris.