K9 Sport Sack® AIR + - Medium / Jet Black with extra (Velcro) detachable storage bag you can take on and off as needed Detachable storage bag (14"x9") Padded back panel for increased comfort and cooling Thick pressure relieving shoulder straps Mesh dual side pockets for increased ventilation Dual side pockets Sternum strap Our thickest, most comfortable shoulder straps Side ventilation mesh Side cinch straps Chest clip Pet lumbar straps for extra back support Collar and harness safety loop