This envelope measures 4.5x5.75 when complete. It holds a standard 4.25x5.5 card perfectly. SVG included.
I did a set of insert cards for my mom, but they weren't a standard size when finished. I needed an envelope large enough, right dimensions, and fitting on a 12x12 piece of paper . . . the rounded envelope in this set worked when I sized it up to fit! Easy to use and assemble, can be sized up a bit more than other envelope patterns due to the rounded ends (turn diagonally to cut).
I love this files.