1. Suitable for the under - seat dimensions of most airlines. Each airline has its own rules and regulations. Please consult your airline before flying with your pet. 2. The mesh windows are for ventilation, and the top and side zipper entrances are for the safety of the pet. The pet carrier has a removable base insert to create a solid surface for your pet to stand on, as well as a removable and hand - washable comfortable wool bed to provide a comfortable sleeping place for your traveling pet. 3. It is equipped with a carrying handle, an adjustable shoulder strap (which can also be used as a seat belt), and a back strap to secure the carrier to the luggage. There is also a carrying handle and an adjustable shoulder strap (which can also be used as a seat belt). 4. Safety information: - 1. Pets should not be left unattended in this carrier. - 2. When traveling by car, please ensure that the carrier is only secured to the car seat using the seat belt. - 3. Contact the airline before flying with your pet to avoid unnecessary trouble and travel disruptions.