John Mascis Fender Strap shoulder bag, Magenta Flower color. The John Mascis Fender Strap is a cotton and polyester shoulder strap, with leather ends, created in collaboration with guitarist John Mascis, of Dinosaur Jr. The Magenta Flower finish features psychedelic themes on a purple base and blue, yellow and orange strokes. Adjustable between 86 and 150 cm. Width 5 cm.