K9 Sport Sack Air 2 | The Original Backpack Dog CarrierThe Air 2 is a durable and breathable mid level backpack perfect for small to medium size dogs. Priced to be a great value and blend of comfort and features. This backpack is recommended for intermediate walks, hikes, public transportation, and bike rides. The Air 2 is constructed with durable Cordura fabric and form fitting mesh on the sides for breathability. For Dogs Ranging 4 30 lbs (2 13 kgs) FEATURES Ventilated side panels for cooling Adjustable