according to the inquiry, life search shows that heating is enough. 711' s lunch box materials can be heated by microwave oven.

bento, also known as bento, means boxed meals. During the reign of Jingkang in the Song Dynasty, there was a kind of underpants, which was narrow and close to the body, with four seams in front and back, and was fastened with ties, which was called bento. It's a kind of underwear and has nothing to do with food. This form converged in Shaoxing, but it returned to its original state before Jingding.