This is fabric from a Montbell trekking umbrella. It's waterproof and thin, so would it be suitable for repairing a backpack (applied from the back with rubber-based, strong adhesive)? Height: Approximately 15cm Top/Bottom Diameter: Approximately 28cm, 35cm Please cut it to the appropriate size for use. I used it to repair an Aqua Barrier Sack (photos 2 and 3), and the main body (photos 4 and 5), applying it with Super X adhesive.