Get the Bentgo All-in-One

If you want one box that holds a whole sandwich and a drink without a separate bottle, the Bentgo All-in-One is your best bet. It’s the only mainstream adult lunch box that does the whole job in one piece.

The bottom is a 4-compartment bento container — plenty for a full sandwich, plus some fruit or chips. There’s a leak-proof water bottle that snaps right into the lid. That’s it: box, sandwich, drink, all one unit. No reaching into your bag for a second item.

I’m not usually a fan of gimmicky “built-in” designs, but this one works. The bottle is actually attached, so you can’t forget it. It’s BPA-free, durable, and the whole thing is top-rack dishwasher safe if you remove the seal. The main downside is that it’s plastic, so if you’re hunting for a stainless steel or glass option with an integrated bottle, they basically don’t exist — you’d be back to carrying a separate thermos.

If you want the convenience of one item, this is the one. It’s not the most eco-premium option out there, but it’s the only one that will actually let you leave the house with just one thing in your hand.