Best-selling bento! The Three-in-One is a three-piece nesting bento lunch box set. This nifty bento container makes it easy to pack a variety of foods and keep them all separate - and safe from squishing! Our Three-in-One is perfect packing a healthy entree and two side dishes. The Three-in-One is modular. You can pull out the snack container and use it separately, freeing up more space in the upstairs for more food. 100% high-quality, food-grade stainless steel.