US-based graphic designer Nathan Hinz developed this beautiful, handheld portfolio back in the days before everybody went online. Each page is a window envelope, which displays an image and info of a project.
Hinz comments on Behance: "It allowed for a quick overview and served as a rich presentation in one book. It's completely handmade, mostly with found materials, my favorite being the spine made from orange duct tape I have never been able to re-find, sadly.