Set includes 1 large box and 2 mini containers that fit inside the larger one. The small, spill-resistant containers have individual lids, so they can be used for sauces or even on their own. With the interior divider they also offer flexibility in arranging meals to keep foods separate. The bento box lid has two locks and a silicone seal to keep it from leaking. It also has a built-in vent, so it is easy to heat up a meal in microwaves. The box can be carried with the built-in handle, and fits in most lunch bags. Multiple bento boxes easily stack for storage. Everything is made from durable plastic, which is completely BPA free and dishwasher safe to make cleanup easy.