Check out: https://www.bagbuff.com/ https://www.bagbuff.com/ And their Facebook group. It is oriented around starting beginners on making their own packs. Th

Check out: https://www.bagbuff.com/ https://www.bagbuff.com/ And their Facebook group. It is oriented around starting beginners on making their own packs. They have a good shoulder bag pattern that would be a good place to start if your goal is a messenger bag.