This is the base removable flap purse as it appears without a flap. We make these in 6 sizes to match the flaps. The zipper is along the top on the back side but doesn't show in the picture.
The magnitc snap is the silver circle on the front. Top is also zippered for extra security.
Below is the size chart. This includes both Chicago and Springfield style so it's a larger than most of the size charts you'll see. It also has the applicable flap size for each. If you are totally confused please don't hesitate to call us. We'll be glad to help your understanding.
Approximate Dimensions: 
Chicago:
Small: 9" long x 8 1/2" deep x 2" wide - Uses 8" x 8" Flap
Medium: 10" long x 9 1/2" deep x 2 1/2" wide - Uses 8" x 9" Flap
Large: 11" long x 10" deep x 3" wide - Uses 10" x 9.5" Flap
Springfield:
X-Small: 8" long x 6" deep x 1 1/2" wide - Uses 6" x 6" Flap
Medium: 10" long x 7" deep x 3" wide - Uses 8" x 8" Flap
Large: 11" Long x 7 1/2" deep x 3" wide - Uses 10" x 8" flap