Bum bag by Herschel Supply Co, Collaboration with Hoffman, Adjustable body strap, Secure clasp fastening, Printed design, Zip closure, External pocket, Interior compartment. Herschel Supply Co produces quality built backpacks inspired by vintage mountaineering equipment, American heritage and world travel. With a passion for individuality and personal style, Herschel Supply Co adapts to a new generation updating their bags with a modern fit, shape and feel.