K9 SPORT SACK Air 2 - Medium (17"-20" from collar to tail) / Grey Tags/info included The Air 2 is the backpack dog carrier is a durable, breathable mid-level backpack perfect for smaller to medium size dogs. This backpack is recommended for intermediate grade walks, hikes, public transportation, and bike rides. - Ventilated side panels for cooling - Adjustable dual side pockets - Sternum strap with avalanche whistle clip - Updated Side Mesh - New Side and Back Cinch Straps - Fur Flap (No more zipping your dog's hair in the bag) - Adjustable Collar Enclosure Used only a few times, my puppy out grew it before I could use it more than a handful of times Excellent Pre-Owed Condition/No Rips, Tears, Nor Stains Noted