Material Polyvinyl Chloride (PVC), 200D Cloth, 300D Cationic Oxford Cloth Size:43*23*27cm EXPANDABLE DESIGN : This pet backpack 24.4"L x 13.4"W x 17.3"H with an expandable back design gives your pet more space to rest and increases air circulation, allowing your pet to move around more comfortably and reduces anxiety.backpacks to prevent shoulder strap deviation and maintain the stability of the pet puppy carrier. Great Ventilation & Visibility : 1, The top of the cat backpack can be opened, for your pet to stick their head out off, you can zip the cover on the mesh for breathability and visibility or you can snap on the shade cover to protect from the sun. 2, Three-sided acrylic sheet design can provide good light transmission. There are four venting holes + venting net design on the left and right sides to ensure air circulation and no sultry heat.backpacks to prevent shoulder strap deviation and maintain the stability of the pet puppy carrier. Ergonomic Design : Widened design, adjustable shoulder pad to help reduce load and increase comfort, two retractable buc