Steel and glass. That's the whole answer.

Stainless steel and glass are the only lunch box materials you need to consider if you want to avoid BPA and phthalates.

Plastic is the problem, and it’s not just the kind everyone already warned you about. BPA shows up in hard polycarbonate plastics (the #7 recycling code). Phthalates show up in soft, flexible plastics and PVC linings. And “BPA-free” isn’t the safety win it sounds