I use these to store each of my Graphic 45 paper collections in, along with sticker sheets, pockets and tags, chipboard collection, 6x6 paper pad. I label them on the side with the name of collection and they fit perfectly upright on a shelf and take up very little room. I have used them for many years to hold paper collections along with the photos, and memorabilia I want to use with it. A real must-have for me ! When you are done with that paper collection, you can fold them flat, and they take next to no room, waiting for the next collection.
So that this can be folded flat, the method the handled fits into the top, it slips out every time you lift it up. If you use something to make it stick, you will lose the ability to lay flat. As well, the way this comes together, it has openings that very small items could slip out of bottom. Would work well for keeping collections together on a shelf, but for transport it leaves a little to be desired.