With our Pet Backpack and Carrier, you can make sure your pet is the right size before you go on a pet adventure. Please take a moment to review our sizing chart to make sure your pet is as comfortable and secure as possible. It's a tiny step for you but a huge leap for your pet's wellbeing, so pay close attention to their weight and body type when measuring. This backpack's lightweight polyester fiber and breathable mesh construction combine comfort and durability. It's a great outdoor companion for touring, hiking, or camping. A secure fit is guaranteed by the adjustable shoulder straps and inside drawstring, and an additional layer of protection is provided by the internal rope.