For soup, buy a food jar. For curry, buy a gasketed bento.

The honest answer is that no lunch box is truly leak-proof, but a vacuum-insulated food jar basically is, and that’s what I’d carry soup in. The things that call themselves “leak-proof lunch boxes” are mostly lying.

Normal clip-lid containers fail with soup and thin curries. Warm liquid finds any tiny gap in the seal, and those cheap plastic snap lids warp after a few dishwasher cycles. “Leak-proof” on the packaging usually means “won’t leak if you don’t move it.”

The exception is the classic vacuum food jar. Thermos Stainless King and Zojirushi both make wide-mouth food jars that are genuinely leak-proof, keep soup hot for hours, and have a gasketed lid you screw down tight. Widest mouth you can find is better — it lets you eat straight out of it and handle chunkier curries without a mess.

If you’re carrying rice plus a wet curry, the Zojirushi Mr. Bento stack is the move: soup jar up top, sealed tray below, all insulated. Or get a stainless container with a silicone gasket and four strong locking clips — that’s the only lunch-box-style design that survives being tossed sideways in a bag. Avoid anything where the lid just snaps or clicks; it will eventually betray you.

Before you trust anything with daal, fill it with water, close it, turn it upside down, and shake it hard. If it survives that, it survives your commute. If it doesn’t, it goes back to the store.

Your backpack will thank you.