Kobi Pet Carrier - Soft Sided - Airline Approved, Charcoal, Large Patent pending Length Extender cleverly adds more interior space for your pet when you want it Four sided mesh windows with privacy shades provide added comfort and privacy Three easy access entryways offer convenient top loading or walk-in-entrance Airline approved for in-cabin use. Choose the right size for both your airline and your pet. Small 17"L x 10"W x 8.5"H. Regular 18"L x 12"W x 10.5"H. Large 18.5"L x 12"W x 12"H.