The Air 2 is the backpack dog carrier people know best. Available in sizes XS-L, it is a durable, breathable mid-level backpack perfect for smaller to medium size dogs. The Air 2 is offered at a reasonable price while including the essential safety and comfort features needed for a comfortable experience. This backpack is recommended for intermediate grade 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) View More Sizing Instruction 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 (No More Popping Off Chest Clips)  * Fur Flap (No more zipping your dog's hair in the bag) * Adjustable Collar Enclosure Compare K9 Sport