Here’s a quick and easy tutorial on how to insert magnetic snaps into a bag. It might be common knowledge, but I figure what the hay? It took about 5 minutes to take the pics, and if there’s one thing I love, it’s a tutorial. (things I also love: the X-Men, belts, and English accents)
First make two marks on your lining in the center, and about 1″ from the top, equal to the spacing of the two tines of the magnetic snaps. Then cut two small slits with your scissors at these spots.