There are four sizes available for the pet backpack. You can make a decision based on the weight and back length of your pet. Before making a purchase, please refer to the size chart image. The backpack carrier carry pack is suitable for medium to large-sized canine pets. It is simple to open and carry and has good control to stop your pets from escaping. High-density oxford material is used to make the dog backpack carrier. Improved water resistance stops pets from tearing and scratching. You and your pet will be relaxed and comfortable throughout the day thanks to the cozy, lightweight material that is soft and breathable. The pet carrier has extra-thick cushioning on the back and shoulder straps for added comfort on extended journeys.