Innovative multi-use design: airline compliant pet carrier with most major airlines, car seat, mobile dog or cat bed, and everyday pet travel bag. Rear flexible frame additionally can compress to conform to seat requirements on most smaller aircraft. Extra features include: storage pocket and removable fleece lined interior dog bed. Plus, durable made-to-last materials matched with style and ultimate comfort. Bonus leash doubles as an extra strong shoulder strap, which can also be used to secure pet carrier in place when used as car seat. Large sizes are suitable for most dogs up to 20lbs, 18.5" long measured from rear to chest, and 12" in height measured from paw to shoulder blade. Larger dogs will have a snugger fit. Small sizes are suitable for most dogs up to 4lbs, 13" long measured from rear to chest, and 8" in height measured from paw to shoulder blade.