BACKPACK DOG CARRIER - The Plus 2 is our most complete carrier for small to medium-sized dogs. The thick, padded shoulder straps and padded back panel allow for more weight, and provide extra comfort for you on longer, more strenuous adventures. FIND THE RIGHT SIZE - The Large is best for dogs with a length of 20-22” from collar to the base of the tail, and a girth up to 31”. Typical dog breeds that will fit this size backpack include Australian Shepherd, Small Labradoodle, Collie & Terrier. MULTI-FUNCTIONAL STORAGE - Plus 2 comes with a removable storage pack—great for gear, treats, or other necessities—plus two full-size water bottle holders made with elastic PowerMesh to accommodate even the largest sizes. KEEP YOUR PUP COMFY - Our patented taper-fit design supports & stabilizes your dog to keep them comfy during their ride, while the patented upper arm holes allow their front legs to be free, and patented mesh panels deliver cooling airflow. MADE TO LAST - With heavy-duty 600 lb. test webbing, triple-stitched seams, and bar tacks on high wear areas, the Plus 2 is built to carry more and go further. Enjoy it on adventures with your dog for years to come! Why own a K9 Sport Sack Dog Carrier? The K9 Sport Sack Dog and pet carrier backpack was created so we never had to leave our dog behind ever again! We want to be able to take our dogs where ever and when ever! K9 Sport Sack was created by dog owners, for dogs and owners - to explore, travel, have fun, and grow closer all while being safe, comfortable and easy. Meet the AIR PLUS. The AIR PLUS was meticulously developed to be lightweight, have extra storage, ventilation and comfort for you and your dog. We're so excited to bring you the newest AIR model for 2018. The AIR PLUS is an airline friendly pet carrier. It’s super safe for your pup, comfortable for you, built to last, and warrantied to turn heads!K9 Sport Sack AIR PLUS Features: - NEW Detachable storage bag (14"x9") - Fully ventilated sides for maximum air flow - Padded back side for comfort - Re-designed shoulder straps for human comfort - Elastic straps for water bladders or hanging supplies - Strong 20mm thick bottom rest pad to keep your dog comfortable-Safety D-ring for collar hook-up -Adjustable dual side pockets -Upgraded easypull SBS zipper -K9 Whistle Clip on light reflecting sternum strap -Velcro soft side for custom name tags, safety lights etc. -VETERINARIAN APPROVEDSIZING: Measure from collar to floor in begging position (see image for dog measuring example) SMALL 14-17 inches: 8-14lbsMedium 17-20 inches: 13-20lbs Large 20-23 inches: 20 up to 30lbs* Weight may vary from dog to dog and are only included here as a supplementary metric to assist in correct sizing. Please measure your dog first and use the weight as a secondary consideration.