Inside there is the #1 pocket from this document. Having all these pockets to pick from really does work like magic to get me to make a pocket to add to things! I tend to use the smaller ones in this collection most, but having this file of ones to pick makes it almost impossible for me to procrastinate about sewing one.
Instructions for a zip pull like this one can be found here.
This finished bag is available here in my etsy shop.