OmieBox and Zoku are the ones with built-in cooling lids

If you want a lunch box with a built-in freezer gel lid, OmieBox and Zoku Bento are the two main names. No separate ice pack needed — the lid itself is the cooling element.

OmieBox does it for kids. The ice pack is sealed inside the insulated lid, so you just pop the whole lid in the freezer overnight. It keeps yogurt, fruit, and sandwiches cold until lunch. It’s a little pricey, but it’s tough and the interior is stainless steel.

Zoku’s Bento Lunch Box is the grown-up option. The entire lid freezes, and it’s designed to keep a full meal cold for hours. It’s a bit bulky, but you don’t have to hunt for a lost ice pack ever again.

One note: PackIt does something similar, but the whole bag freezes rather than just the lid. If a freezable bag works for you, that’s a fine alternative. But if you want the lid-based, no-separate-ice-pack setup, OmieBox and Zoku are what you’re after.