Screw-top jars beat leakproof clips in a backpack

The only lunch containers I’d trust upright in a backpack are the ones that screw shut — not the ones that click shut.

Most “leakproof” containers are just a silicone gasket squeezed between two plastic tabs. That works on a flat kitchen counter. In a backpack, it’s a gamble. The bag gets squeezed, the tabs pop, the gasket shifts, and suddenly your yogurt is wearing your desk lunch. Threaded lids physically can’t spring open, and the threads do the sealing — not a clip that degrades over time.

For soup or anything hot, get a stainless insulated food jar with a screw-on lid: Zojirushi, Hydro Flask, or Thermos all make great ones. The threaded cap with a silicone ring is about as close to bulletproof as it gets, and you get hot soup as a bonus. Downside is they’re narrow — this is a soup jar, not a lunch box. Works fine for yogurt too if you’re okay eating straight out of the jar.

For yogurt and cold stuff in a real container, the honest best value is a wide-mouth Mason jar with a plastic storage lid. It’s leakproof, cheap, and easy to wash. If you want something prettier, Snapware’s glass containers with the gasketed, 4-corner locking lids are decent — but note the difference: Pyrex’s two-tab lids are NOT leakproof, the Snapware four-clip ones are. Even then, test any container before trusting it