Airline-approved Cat Carrier: The Sherpa Delta Airlines Travel Pet Carrier is airline-approved and perfect for traveling in style and comfort by plane or car, whether you're going on vacation or to the vet.Fits under the seat: Our patented spring wireframe allows the rear end of the carrier to be pushed down several inches to comply with airline requirements - even under-seat requirements - with mesh panels for ventilation, locking zippers to prevent accidental escapes, and a seat belt security strap which doubles as a luggage strap for added safety and comfortability.Carrrier size & dimensions: This carrier is a size Medium, with measurements of 18 inches long x 11 inches wide x 10.5 inches tall, and can comfortably fit pets measuring up to 16 inches long x 10 inches tall and weighing up to 16 pounds.How to choose a carrier size: Choose the perfect carrier size for your pet based on your pet’s measurements first, followed by weight, making sure not to exceed the maximum weight limit. Allow enough space for your pet to change positions while inside the carrier.100% SATISFACTION GUARANTEED: Sherpa products are designed to meet child safety standards, backed by our 100% satisfaction guarantee. If a customer is dissatisfied with a Sherpa product for any reason, we will replace or refund it.