Screw-top lids are the only lunch containers you can trust with soup

If you’re carrying soup or yogurt, the only lunch container worth trusting is one with a threaded screw lid and a gasket — clip-lock boxes will eventually betray you.

Those popular glass meal-prep containers with the four metal clips and silicone seal are great for rice bowls and salads, but they are not leakproof. One squeeze from a backpack or a sideways bump in a tote bag pops a clip loose, and suddenly your work bag smells like a yogurt farm. The seal is good; the locking mechanism is the weak link.

For hot soup, get a wide-mouth insulated food jar — the Thermos/Stanley/Zojirushi style. The screw-on lid is mechanically simple, the vacuum insulation keeps things hot until noon, and they’re essentially leakproof. Even the cheap no-name versions work well enough. You can also throw a spoon in some models.

For yogurt, you don’t need insulation. A regular wide-mouth Mason jar or any glass jar with a screw lid is bulletproof, cheap, and survives the dishwasher. If you want something purpose-built, there are glass lunch jars with a gasketed screw-on lid that do the same job with a nicer shape for a backpack.

One piece of advice before you commit to any container: fill it with water, screw the lid on tight, and shake it upside down over the sink. If it’s not dry after that, it goes back on the shelf.

A container that leaks once is a container that leaks forever.