I spent Wednesday afternoon making an embroidered pouch to go along with the rosary that I made for Julia. Here are some quick instructions. This could be adjusted for any size or use, like a makeup bag or a electronics pouch.
First, mark out the dimensions you want the bag to be. Don't forget to take into account the seam allowances. My dimensions for one side of the pouch are 4X3.5. I marked both sides on one piece of fabric, so the entire rectangle is 4X7. This is also the time to draw in the embroidery and complete it.
Slipstich the lining to the inside of the zipper tape, fitting it in place first, and making sure the seams and corners are all aligned.
The lining and slipstiching will make a finished inside, with no ravelling threads to get caught around the contents of the pouch. Make sure to put the lining in the bag so the right side is to the inside. It'll look inside out before you put it in there.
Here is the finished pouch with the rosary that I made.