Bum bag by Spiral, From faux pas to hero piece, Adjustable body strap, Secure clasp fastening, Zip closure, Stud embellishment, It's all in the details. 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.