The Sherpa Bag is a luxurious soft-sided carrier. Padded nylon with deep sheepskin insert. Sherpa Original Pet Carriers Feature: Mesh panels on three sides for ventilation. Rigid, reinforced bottom and handles. Adjustable shoulder strap (doubles as a leash). Roomy zippered pocket. Locking zipper front and top openings. Rigid, wire-reinforced end panels for stability and support but flexible enough to accommodate spaces slightly lower than their height. Removable, machine washable faux lamb lining. Folds flat for storage. Medium size: 18"Lx11"Wx10.5"H: Pets up to 16 Lb. Large size: 20"Lx11.75"Wx11.5"H: Pets up to 22 Lb. Small - for pets up to 8 lbs, Dim: 15" D x 10" W x 8.5" H, Weight: 2.72 lbs.Before you buy - Contact your airline for their carry on pet regulations. For more information visit: http://www.sherpapetgroup.com/guaranteed_on_board