We've used a combination of things over the past two and a half years of day care. We have Built Gourmet Getaway bags that we'll put steel thermoses in with hot food or we use To-go ware containers for cold lunches. We have an assortment of 4 ounce containers that we've used for snacks and small servings of other things going in lunch. The Built bags are big but my children are twins so we can fit two hot lunches in one bag. Next year, for kindergarten, they'll be in the same class so I'm not sure if we'll send lunch together together or split it up but either way, we'll use the same lunch bags. Part of what I like about the Built bags is that we can use them on the weekends, I use them for lunch, etc. and there's plenty of space for whatever we need without the bag being too bulky for a child to use daily. I like the flexibility of the options we have to adjust to whatever food we send.