Transform and personalise your backpack by applying iron-ons. It's easy: simply iron them on (depending on the surface). METHOD: Place the iron design with the glue side facing the fabric. Place a pressing cloth over the design and press with an iron set to cotton without steam. Iron for about 10-20 seconds to attach the patch. Use a hard surface and clean, dry fabric to ensure the patch is well-attached. Wash at 40°C - wash inside out or in a delicates bag. If the backpack cannot be ironed, you can hand-sew the patch on using small stitches with great results.