Steel is the lunch box winner.

Stainless steel lunch boxes are the best way to cut plastic waste without driving yourself crazy.

The only reason steel gets the top spot over glass and bamboo is simple: it’s the one that actually survives real life. A good stainless box with a silicone gasket and a latch is genuinely leak-proof — I’ve carried yogurt and saucy leftovers in mine without a single spill. Bamboo boxes look lovely, but most are not truly airtight. They’re really for dry sandwiches, not tzatziki. And glass? It’s leak-proof and non-porous, but it’s heavy, and you’re one fumble away from a shattered masterpiece in your work bag.

Steel takes a beating. Glass breaks. Bamboo can warp, stain, and absorb odors over time. Steel also cleans easily and doesn’t hold onto yesterday’s curry smell. One thing to watch: some steel boxes come with plastic lids, which is still a reduction, not perfection. But if you want years of daily use with zero plastic baggies, steel is the move.

Future you won’t be picking shattered glass out of a parking lot.