Small igloo type of bag

I am looking for a small (not too small) kinda cooler. I’m flying to U.S. soon and my daughter won’t eat the plane food, so i wanna have some stuff for her…but i need to be able to put it in a big carry on bag. i have two small ones, but i need one a little bigger…anyone know where you can buy thoughs?

I’ve seen them in several camping shops. There are some of those shops on the south side of Xinyi Rd, a couple more just north of the intersection of Chunghsiao and Chungshan, and a couple more on Dingzhou Rd a bit west of the intersection with Keelung Rd.