Do It Yourself Canvas Messenger Bags. Tote around all your supplies with a style all your own thanks to these fun DIY crafts. These over-the-shoulder canvas bags were designed for both boys and girls, and are just the right size for notebooks and school papers. 12" bags come with a flap and 33" handle. (6 pcs. per set) We recommend using fabric markers, fabric paint pens, permanent markers or acrylic paint, sold separately online.