Airy and light with 360-degree ventilation, the Pet Carrier has a back pocket sleeve to securely place over your carry-on, and a memory foam mattress for elevated comfort. A foldable design makes it easy to pack within a suitcase when not in use. Airline-compliant for cabin use. Poly-mesh / performance-nylon exterior. The Medium size is the best seller. ◄Size & Details - Weight: 4.6 lbs (Medium), 4.0 lbs (Small)- Dimensions Medium: 17.5" L x 11" W x 10" H- Dimensions Small: 15" L x 10" W x 8.5" H- Max pet weight supported: 25 lbs (Med), 15 lbs (Small)- Volume: 36L (Med), 25L (Small)- 360 degree ventilation ensures a cool and breathable space- Memory foam mattress (removable and washable)- Dual exits and leak proof- Fits underneath the airline seat on medium and large planes ◄In the box - Pet Carrier - Shoulder strap- One cotton storage cover ◄Returns & Warranty - Free 90 day returns and exchanges on unused items. Learn more. - Two year limited warranty on parts and workmanship. Learn more.