But if you want a bigger than 7 pocket opening you must. They are not difficult to sew and only require a little planning to design.
8 x 12 including seam allowance of 12 to make a 7 x 5 internal zipper pocket for the bag.
Sewing zipper pocket. Zipper pockets provide a secure place to store items such as credit cards and money. Sew all the way around the rectangle. Then use a seam ripper andor small scissors to cut out the line and the legs of the two triangles making sure not to cut the stitching.
Sew around the rectangle through all layers. This should secure the interfacing pocket piece and the main body piece together. The zipper opening at the pocket is 7 if you dont have the exact zipper size you can always use a bigger zipper i used 8.
How to sew a zipper pocket. They can be easily added to any purse pattern and positioned either on the inside or the outside of the purse.