Airline Compliant Pet Carrier In-cabin compliant with most major airlines. Pet carrier can compress an additional 1.5-2” in height when rear pocket insert is removed. Simply remove the rear pocket insert in the pet carrier prior to air travel. FLEXIBLE REAR FRAME FOR EASY IN-CABIN PLANE TRAVEL: Rear pocket has a removable insert that provides structure for everyday use, and can be removed during plane travel to allow the carrier to conform to the in-cabin pet carrier requirements of smaller aircraft. BONUS LEASH & EXTRA FEATURES: Shoulder strap doubles as a bonus leash which can also be used to secure pet carrier in place when used as car seat. Includes storage pocket, removable fleece-lined interior dog bed, and carabiner for poop bag holder, keys or leash storage. SIZING GUIDE: SMALL sizes are suitable for most dogs up to 12.5lbs. LARGE sizes are suitable for most dogs up to 20lbs. Please see sizing guide in image slideshow for more details. Larger dogs will have a snugger fit.