Caribou Media Outdoors show the Mystery Ranch Gravelly 18 attached to metal frame or Metcalf pack... "This is a breakdown of the Mystery Ranch Gravelly 18. This small, but mighty pack can stand alone on its own, piggy back onto the front of the NEW Metcalf packs, or attach to the NEW Ultralight MT Frame. Watch until the end to see how this pack is really three packs in one!"