In certain embodiments, a fastening means, such as snaps, hook and loop fasteners, or the like may be used to detachably fasten the distal end of the flap 80 to the bottom portion of the backpack 10 so that the flap 80 can wrap around the wheels 45 and 55 to protect the user's back from discomfort that may result from pressure from the wheels 45 and 55 placed on his back.