If you have the skills to create design projects, then I can suggest you to make personalized packing boxes for your gifts. If you are at least a little versed in working with programs for graphic editing, then you can do it without having any special knowledge. I used
this mockup for print boxes. All I needed was to add my sketch to this template and print this file. You can also assemble such a box without any problems. The only problem you may have is how not to be mistaken with the dimensions, but I chose the standard aspect ratio. It suited my gifts perfectly.