The 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. FEATURES Ventilated side panels for cooling Adjustable dual side pockets Sternum strap with avalanche whistle clip Wide Base to accommodate your pet and its tail Updated Side Mesh New Side and Back Cinch Straps Updated Shoulder Strap Design Fur Flap (No more zipping your dog's hair in the bag) Adjustable Collar Enclosure