Flip it right side out.
Add your snaps.
I added a scrap to the outside by folding and pressing a scrap to fit the outer flap them sewing it on with a zig-zag stitch. This will also close up the opening that you made to flip the rectangle.
The GPS now has a manly home :)
This could be a good stocking stuffer, quick and easy. What kind of man crafting do you do?