This is a pack of 50 disposable bento boxes. They are new, unopened, and unused, but the outer packaging has had small holes in it since the beginning and is not sealed. As the outer packaging is unopened, based on visual inspection from the outside, I believe the lid and base are attached. The manufacturer is unknown. It appears to be able to hold approximately 250-270g of rice. They will be shipped in a Yu-Packet Plus dedicated box. Please understand that due to the tight fit, they will be shipped without cushioning material.