Twenty four peg loom - I used Knifty Knitter loom. The gauge is not exact but very close using flat knit stitch with the U-wrap. It does not have to be exact for this pattern. You will need small amounts of yarn in the colors of your choice.
This bag can also hold an ID and or debit/credit card inside in a pocket. Beside a phone you can fit a small pocket notebook and/or a small set of doggie bags/doggie treats/etc.