Boston Red Sox Backpack. Officially licensed by Major League Baseball. This Boston Red Sox backpack is designed and crafted to meet the highest standards of quality and performance. Backpack is made of 100% nylon. Backpack features colorblock design with reflective piping. Compartment has zip closure, headphone access, 2-way pull tab zipper, front compartment with with zipper pocket and pen holder, mesh side pockets and adjustable padded straps. Embroidered team logo at front.