[I've substantially updated this article recently to answer some emailed questions about bento accessories and so on, so here it is again for your reading pleasure. Originally posted in August 2008.]

I recently got an email from a Just Bento reader concerning the plastic used to make bento boxes. She was concerned, since she couldn't read the Japanese writing on the packaging. I'm sure a lot of other readers have similar concerns, especially given recent scares reported in the media about plastic containers leaching chemicals into food and beverages. Keeping in mind that I am not a scientist or expert, just a concerned consumer just like you, here's what I've been able to find out by doing some research on various Japanese as well as English-language web sites.