Expandable and Foldable: This pet carrier backpack is designed with an expandable back that provides your pet with more space for activity and reduces anxiety And the carrier can collapse flat when not in use Measures 13x98x165 inch easily fits most smallmedium-sized pets weighing up to 18 lbs Strong construction: Equipped with a durable rod on the top and both sides are fixed with frames to stabilize the structure plus a firm bottom pad offers solid support for your pets Also comes with a safety leash to prevent escape this pet backpack carrier is sturdy and safe for your pets comfort for Your Pet: Mesh windows on 4 sides for optimal airflow 4 entrances (sides front and back) allow your pet to enjoy the outside scenery and easy entry into the carrier and 1 expandable soft mat to keep your pet comfy during the journey Functional Design: Made with quality and water repellent 300D Oxford fabric for long-lasting use 2 side pockets to store pet supplies and a roller blind can be pulled down to protect from the sun The travel backpack carrier is portable for traveling camping hiking biking going to the vet or walking in the park comfortable Wearing: Breathable sponge mesh of the back and wide padded shoulder straps help relieve the stress of your back and shoulders making the dog backpack a breeze to wear for long trips While a chest buckle keeps the carrier backpack stable for pets