THERMOSNovelty Lunch Bag for School Kids - Fruit Apple| 100% Pvc Free With Peva Linings | Temperature Retention Performance | Zippered Opening For Easy Access| 3 Years+

This is a good size for preschool. My son is 3.5 and it doesn’t look big with him holding it. Very light and the zipper is easy to open. It fits his bento box exactlly and you won’t find a room to put anyother thing but I’m fine with it. His bento box is from 22.5 cm x 17.5 cm x 5 cm if you want the exact measurment.