Doggy backpacks cats small dog pet carriers for travel bag airline approval The bottom provides nice support for your pet.It was big enough to carry a 20 lb pet. There is plenty of mesh around the backpack carrier that gives you peace of mind to know that you pet is receiving plenty of air and ventilation. The back and the straps are both padded. This makes the carrier comfortable for you while carrying it. Adjustable Straps. This allows owners of various girths to be able to carry this pet carrier. Removable base, easy to clean.