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, roll down flaps for privacy, top and side entry with locking zippers for safety, padded adjustable, no-slip carrying strap, seat belt/luggage strap, machine-washable faux lambskin liner, Delta luggage tag 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 Sherpa's Guaranteed on Board program Size medium is for pets up to 16" L x 10" H and up to 16 lbs.Small - 15" long x 10" wide x 8.5" high.Medium - 17" long x 11" wide x 10.5" high.Large - 19" long x 11.75" wide x 11.5" high.