Does anyone know of a backpack/sling bag/messenger bag that will hold a full size camera and a 21" Monopod? I know there are bags that have straps that would keep the pod secured but it would remain exposed. I would prefer to just place it directly in the bag if possbile. I've seen a couple... the Tundra by National Geographic and Bogen; however, based on the interior measurements I saw, it's a little too small. Thanks!