This messenger bag was created using 3 crocheted motifs. I crocheted a panel for the sides and the bottom so that it could hold more. Then I threaded a tapestry needle with a long length of yarn (the same yarn I made the bag with) and used an assortment of wood beads. I tied a square knot onto a plastic ring on each end. Then I sewed the rings onto the bag.
I measured the finished bag and added one inch to those measurements to know how to cut fabric for the lining. After cutting the fabric, I sewed a seam on three sides with the right sides together. Then I hand sewed the liner into the bag.
I hope that this helps you to see how easy it is to make your very own messenger bag. The greatest part about being able to do this is that you can have something that is uniquely yours. It's okay to be different. In fact, it's great!