The best leakproof soup container is a thermos-style food jar.

If what you’re packing is broth, curry, or yogurt, skip the “leakproof” plastic lunch boxes and get a stainless steel vacuum-insulated food jar instead.

Most snap-lid containers are leak-resistant at best. They’re fine for a sandwich or a dry snack, but the moment you tilt a bag with curry inside, you’re living dangerously. A thermos-style jar uses a threaded lid with a silicone gasket that actually creates a seal. You can throw it in a bag upside down and it won’t weep.

The other big win is temperature. A wide-mouth Thermos, Stanley, or Hydro Flask food jar keeps soup hot (or yogurt cold) until noon, so you’re not stuck reheating or eating lukewarm lentils. Glass jars like Weck or Mason jars are also truly leakproof with the right lid, but they’re heavy, breakable, and don’t insulate.

If you’re set on a bento-style box, look for one with an explicit “liquid-tight” claim and a rubber gasket on every compartment — but know that most are designed for kids’ snacks, not adult curry.

One jar, one spoon, no regrets.