This is a Foodman bento box with a dedicated size insulated case. It's airtight, so it won't leak or spill even if you put it upright in your bag. It fits in small spaces, even when you have a lot of other things like for club activities. I accidentally bought two sets and am selling the one I haven't used. I've used it a few times, but it's in good condition. It's a used item, so I'm selling it at a low price. Please understand this before purchasing.