This zippered pouch, about 9" wide by 7" deep, snaps on to the rings of your sling with a 10" long strap. It adds the convenience of a pocket without adding weight to the sling's tail, or interfering with using the tail as a coverup. This allows you to store small items like keys, wallet, sunglasses, pacifiers, diapers and wipes, etc. for short trips out when you don't need the whole diaper bag. The strap has two sets of snaps, so you can attach the pouch at a height that is comfortable to you, or use it as a wrist strap, snap it to your stroller, or hang it from a grocery cart handle. (Fabric shown is an example; actual pouch will be made with the same fabric as your sling.)
If you are sending fabric for your sling (including a wrap for conversion), I need about 10" of the wrap for the pouch. I use a cut that goes from hem to hem, so for example, if you want a size small sling plus the snap-on pouch, I need 73" for the sling plus 10" for the pouch, or 83" total.