The recycling number tells you more than the label

The BPA-free label on a lunch box is mostly marketing — the recycling number on the bottom tells you what you actually need to know.

Flip it over and look at the triangle. Plastics numbered 1, 2, 4, or 5 don’t use BPA in their chemistry at all, so “BPA-free” on those is just a sticker. The ones to actually look at are 3 and 7: #3 is PVC, and #7 is the catch-all “other” bucket where polycarbonate lives. Polycarbonate is the plastic that’s made with BPA.

So if you see a #7, the BPA-free claim is doing the heavy lifting. Some #7 plastics genuinely are BPA-free — they’re bioplastics or Tritan — but you can’t tell from the number alone. That’s when you have to trust the manufacturer’s word. Also note: many lunch boxes don’t have a recycling code printed at all, because the code is only required on containers, and a lot of lunch boxes from Chinese factories skip it. In that case, the brand’s testing documents are your only proof.

Worth knowing: BPA-free doesn’t mean chemical-free. When manufacturers dropped BPA, a lot swapped in BPS or BPF, which appear to do similar things in the body. And the actual risk is modest — BPA is an endocrine disruptor, but you have to actually ingest the leached plastic, which mostly happens when you heat the container or put hot, acidic food in it. Don’t microwave a lunch box and you’ve cut most of the risk.

If you want to skip the whole debate, buy stainless steel, silicone, or fabric-lined. Nobody has ever needed to check the recycling number on a bento box.