Is it safe to use a stainless steel bento box for kids' lunches?
Based on 2 peer-reviewed studiesbaby
Verdict: Safer
Yes. Stainless steel bento boxes don't leach and hold up to years of daily use.
What's actually in it
Food-grade 18/8 stainless steel bento boxes contain no plastic. Small silicone seals are platinum-grade in good brands. Acidic foods can release trace nickel in the first few uses, but that settles.
What the research says
A 2025 study in Int J Environ Health Res found quality stainless steel leached little compared to plastic and aluminum. A 2025 study documented big plastic particle release in containers.
For daily school lunches, a stainless steel bento box with sections is hard to beat. Pair with reusable silicone baking cups to separate foods and beeswax wraps for the sandwich.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Heavy metal transitions from cooking utensils. | Int J Environ Health Res | 2025 |
| Release of Nanoplastics from Polypropylene Food Containers. | J Agric Food Chem | 2025 |
What to use instead
Browse our vetted, non-toxic alternatives. Every product is third-party certified.
Shop Non-Toxic Baby