One size fits all.
Hand-painted, fluro orange and black, water-resistant, reflective, bag cover. Pull toggles to tighten onto any sized backpack and attached the elastic loop to the toggle on the other side. This way you can access items in your bag by simply pulling the top of the bag cover down and you can leave it on your bag. Reflect'o covers make your backpack look more attractive. :D
*Also works on pannier cycling bags, airplane-sized bags, bike baskets....
Made in Adelaide, Australia from hemp/organic cotton. I cut out the bag cover fabric along with their reflective shapes and fuse them on to the fabric which I paint with eco Permaset ink. Local, Adelaide tailors skillfully sew them up.