Screwpost portfolios allow you to easily add and remove pages whenever you like. They require either hinge strips, sheet protectors, or pages that have a margin with scored and hole punched pages.
Portfolios are named after the page size they hold and are a bit larger to perfectly accommodate that page size. For example, an 11 x 14 portfolio will hold 11 x 14 prints.
You can view this short video tutorial on how pages are added to our screwpost portfolios using hinge strips or sheet protectors. You can also view this blog post about how to easily add pages using hinge strips.