Arizona Cardinals NFL Fan Backpack by NFL. $19.99. Durable Nylon Construction. Adjustable Padded Shoulder Straps. Roomy Exterior Pocket with Side Mesh Pockets. Measures Approximately 16" x 12" x 5". Officially Licensed. The perfect backpack for the die hard or casual fan. Carrying your belongings is more fun with this Most Valuable Fan backpack by Little Earth.