They are a hard sturdy plastic. The Bento boxes come with a strap to hold together. They come with a free lunch bag and they are stackable. My favorite part is they are BPA free! That makes them great and safe!
Overall, I really really love these. I have a thing for lunch totes and bento boxes and this is my all time favorite bento box yet!
Product DescriptionProduct comes in retail packaging
Great for poeple looking to diet
Multi-Compartment and Stackable
Made of BPA-Free Plastic
Comes with Free Lunch Bag