1、EXPANDABLE: With the rear expandable design, the space inside the backpack can be doubled. It can increase ventilation and make your pet stay more comfortable in it. 2、STRONG CONSTRUCTION: Pet carrying backpack comes with a strong reinforced structure that prevents the backpack from collapsing on your pet while traveling. 3、SAFETY LEASH DESIGN: The safety leash inside prevents your dog from escaping when you open the top mesh window of the pet carrier backpack to let your pet stick out its head. 4、MULTIPLE BUCKLE STRAP: Dog travel backpack comes with waist and chest buckles to provide you with extra support and keep the backpack stable, preventing your pet from slipping. 5、WITH STORAGE POCKETS: This pet carrying bag is designed with front and back storage pockets, convenient for storing cell phone, change, wet wipes, leash, snacks, etc.