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) AIR 2 sizing: XS 10-13 inches, S 13-17 inches, M 17-20 inches, L 20-23 inches Ventilated side panels for cooling Adjustable dual side pockets Sternum strap with avalanche whistle clip Fully updated sizing (each piece of the bag adjusted to ensure best fit) Side and back cinch straps included on backpack pet carrier Updated Shoulder Strap Design Fur Flap (No more zipping your dog's hair in the bag) More Adjustable Collar Enclosure Updated logo on animal carrier Warranty coverage includes, but is not limited to, manufacturer defects, product malfunctions, sizing issues and incompatible dog personalities within 60 days of purchase. All K9 Sport Sack carriers are specially developed under the close direction of animal professionals, veterinarians, dog trainers, and outdoor product engineers to be ergonomic, safe, and strong. For additional information on this product, please see the Product Documents section for all downloadable user manuals, installation guides, brochures and warranty statements.