Another Flex Box remix

This is a remix of the now well known Flex Box by 4volt. I've made a few variations of this now, but this one is simple and reliable. This remix essentially moves the recesses on the top cover to the edge of the lid component, making a pseudo catch for the lid. It works pretty reliably on it's own, but I'd still recommend having a band around it during transport if you don't want it to open and spill everywhere.

I also edited the attachment point on the back where you'd tie elastic, and incl