These boxes are a perfect solution for storing our various product manuals in boxes on a bookshelf, with the manuals in separate boxes according to the product's location in the house (basement, 1st floor, 2nd floor, outside/garage). This makes it much easier to find a specific manual without having to examine every manual.I like that these boxes are enclosed (rather than open in the back like a slash-style magazine box) so the manuals won't collect dust. Most other storage boxes are wider than I wanted, so it was nice to find the 1.5-inch (40 mm) as an available box width.The boxes are made of flexible plastic and arrive packaged flat. They have a strong chemical smell at first, but it dissipates. You fold them into their box shape, and the front cover closes with a velcro button. The assembly was straightforward, but instructions are not provided, so if necessary consult the assembly diagram on the product page. I like that there is a label pocket on both the box's spine and front cover.