The Trina backpack pattern comes in three sizes and features multiple zipper security pockets, slip-in vinyl pocket, and expanding water bottle pockets on the sides. Adjustable straps complete this bag to make it truly customized. It's lined inside and is suitable for any woven fabric. Make it with foam interfacing for extra body or use fusible fleece for a "squishier" bag. Watch the video walk through if you need it. Full size Trina measures approx 16.5" x 18.5" x 5" Medium measures 15" x 16" x 4" and Small measures 12" x 13" x 3"