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Someone told you steel is the safe one. Then you read that it cannot go in the microwave, and now you are not sure what you are buying.
Two questions, and they have different answers.
Yes, stainless steel lunch boxes are safe. Ours are independently tested for lead under the US CPSIA, and we retest every year. Your food touches uncoated 18/8 steel and nothing else.
The honest part comes after that. Steel costs more, shows fingerprints, and stays out of the microwave. Below is all of it, in order.
Yes, and here is the test report
Safe is a word anyone can print on a box. So here is what it rests on.
What the lead test covers
Our boxes are tested for lead under the US CPSIA, the federal rule for children's products. The report is issued by an independent lab, and we retest every year.
It is on our certificates page. Free to download, no form and no account.
That last part matters more than it sounds. A brand that makes you ask for the report is a brand that would rather you did not read it.
Where the boxes are made, and who tests them, is in Where Is Blockhütte Made?
What your food actually touches
18/8 stainless steel, uncoated on the inside.
No liner, no coating, no plastic parts anywhere on the box. There is nothing to flake off into your lunch, because there is no layer to flake.
That is also why there is no metallic aftertaste. The steel is non-reactive, so tomato sauce on Monday does not turn up in your rice on Tuesday.
Can you microwave it?
No. Never.
Steel reflects microwaves instead of letting them through. You get sparking, and you can end the microwave along with the lunch. This is true of every steel box, not just ours.
If your lunch routine is built around a microwave at noon, a glass container will serve you better. We would rather say that than sell you the wrong thing.
What to do instead when you want hot food
Put the heat in before you leave, and carry it.
That is what the insulated food jar does: 14 hours hot and 19 hours cold, with no preheating. Soup, stew, curry, chili.
It rests on one habit. Rinse it hot, fill it full, keep it closed. A half-full jar cools faster, whatever the label says.
And the oven is no problem at all. Steel goes straight in, lid and seal removed. You can bake in the box you carry it in.
Stainless Steel Lunch Box
The stainless steel lunch box for adults that survives a real commute. Two removable dividers...
Get YoursSteel or plastic?
The short version, side by side.
| Stainless steel | Plastic | |
|---|---|---|
| Microwave | No | Usually, check the label |
| Oven | Yes | No |
| Stains and smells | Neither | Both, over time |
| Gets brittle | No | Yes, with age and heat |
| Microplastics in your food | No | A known concern |
| Repairable | Yes, part by part | Rarely |
| Price | Higher upfront | Lower upfront |
Plastic wins one row, and it is the row you use at noon. Steel wins the rest, and it wins them for years.
What steel costs you
Three things, and none of them are dealbreakers. But you should hear them before you buy.
The price. Steel costs more than plastic, upfront. Working it is harder and shipping it is heavier, and that shows in the number.
Fingerprints. Bare steel takes them. A wipe removes them, and a brushed finish hides them. Everything else about cleaning is in our lunch box care guide.
Scratches. Keys and cutlery leave marks. They are also why a five-year-old box looks used rather than new. Some people like that. Some do not.
What none of them do is shorten the life of the box. That is the difference between a flaw and a wear item.
What is the warranty?
Three years on material and workmanship, from the date of purchase. Before that, 60 days to send it back if it is not for you.
The full terms are on our warranty page.
When a seal fails, you buy a seal
After year three the warranty is not really the point. What matters then is whether a worn part means a new box.
It does not. Every wearing part is sold separately: seals, lids, dividers, clips.
A spare seal is already in the box when it arrives. That was the plan from the start.
Why the seal, not the steel, decides whether a box leaks: what makes a lunch box leak-proof.
Is it safe for kids?
The same steel, in smaller sizes. The 27 oz box holds a school lunch, and the latch is easy to work for small hands.
Parents usually ask two things. Is it safe? Independently tested for lead under the US CPSIA, and the report is on our certificates page.
And how does it not get lost? A name, engraved into the steel. Twenty bags on the same hook, and only one has her name on it.
For school and daycare picks, see the kids collection, or jump straight to back to school.
More on sizes for school lunches: What's the best lunch box for kids?
So who should buy one, and who should not
If you reheat your lunch in a microwave every day, buy glass. Nothing here changes that.
For everyone else, the commutes and the desks and the hikes and the hot ovens, the case is easy. Start with the leak-proof bento lunch box, or browse all stainless steel lunch boxes to find your size.
Not sure which size fits your lunch? We compared all of them in best stainless steel lunch boxes for adults.
