Bum bag by Spiral, Bag it up, Branded lining, Holographic design, Adjustable body strap, Secure clasp fastening, Small logo detail, Zip closure. Bored with the basic backpack, Spiral's bags pack a punch with bold, striking designs. Tough and durable design meets trend-led prints across their colour-block styles and signature printed backpacks, which conceal all those handy necessary compartments too.