Sherpa Travel Original Deluxe Airline Approved Pet Carrier Perfect for traveling in style and comfort by plane or car, for an adventure or just a trip to the vet Patented spring wire frame allows the rear end of the carrier to be pushed down several inches to conform to under-seat requirements Mesh windows for ventilation, top and side entry with locking zippers for safety, padded adjustable, no-slip carrying strap, seat belt/luggage strap, machine-washable faux lambskin liner Rear pocket for convenient storage of treats, leash, bags, or anything else your furry friend might need on the go Approved for use on most airlines and included in Sherpas Guaranteed on Board programSize medium is for pets up to 16" L x 10" H and up to 16 lbs Medium carrier measures 17 L x 11 W x 10.5 H Do NOT select the carrier size based on weight only. Choose the carrier size based on your pets measurements first, then make sure not to exceed the maximum weight limit..Carrier is intended for safe and comfortable travel; the pet will not have excess room to move around