Do you have a laser cutter? Do you need an emergency shipping box?
The USPS Priority Small Flat Rate Box has a nice template that can produce an easy to cut resizable box from the endless supply of throw-away cardboard boxes from your online Prime and other shopping adventures.
I traced a curve after a photo of such a box laid flat on the floor, made some adjustments and ended up with a digital template that can be resized and adjusted to your needs. Makes for some recycled cardboard shipping boxes for those who think they might save a tree or need a quick sturdy box to ship something and don’t have one handy. Maybe this comes useful to someone.