Measure Your Pet Before Purchase:This expandable pet carrier airline approved can be extended on 3 sides.The size of pet carries is 17.5"L x 12"W x 11.5"H and expandable size is 30"L x 27"W x 11.5"H by expanding the 3 mesh windows. This carrier is weight about 2.5lbs and fits pet up to 12lbs.Suitable for small or medium cats and dogs. Breathability and Comfortable:The 5 sided mesh design of this pet travel bag provides plenty of breathability and visibility in any situation, allowing your pet to observe the outside world.With 3 expandable compartments, this cat carrier provides additional space on 3 sides so the pet can stand up and turn around without crouching and contortion on 3 layers removable comfy pads. Convenient and Safe:This dog travel bag straps securely to the front car seat with a seat belt and shoulder strap, keeping your pet restrained and safe while driving.Designed to meet TSA and IATA requirements for under-seat use Carefully dimensioned to meet domestic and international airline under-seat requirements. Strong and DurableThis airline-approved dog carrier is made of high-grade polyester and mesh, which will not cause the top to collapse. Self-locking zipper design of pet carriers give your pet a spacious space, ensuring the safety of your pet. Widely Use and Easy to Carry:Handheld; Carried on an adjustable shoulder strap; Dog/Cat carrier; Car seat; Luggage top; Under an airline seat, ideal for long trips, car rides, plane rides, vet visits, holidays, possible airport delays, waiting stops and family use.