This incredible reference shows hundred of patterns for boxes, cartons, tubes, displays, etc. I don't mean "four sides and a bottom", though you have plenty of those. I mean things with internal dividers, things the hold together by themselves, decorative, utilitarian, and the entire range.
This book has an industrial orientation, as if you're planning a die-cut paper product. It also assumes that you're a fairly skilled designer. Although the patterns are given in full detail, you'll have to make lots of adjustments. That includes sizes, cardboard thicknesses, customization, and proportions. That last can be tricky, because so many of the measurements interlock with with each other, and Roth hasn't given any indication of what the dependencies are. Some of the more complex pieces also appear to assmble in non-obvious ways, which you'll have to work out for yourself.
Still, many of these patterns are well within the reach of a home crafter, and offer some exciting possibilities for gift boxes and other kinds of containers or stands. The patterns aren't the kind you can cut out directly from the book, but can be scanned and scaled, or just act as a conceptual inspiration.
Whether you're a commercial designer or a paper-crafting hobbyist, this is a unique and incredibly rich resource. Even if it doesn't solve your design problems directly, it shows hundreds of techniques that can be adapted to your own solutions.