REAR EXPANDABLE DESIGN: With the rear expandable design, the space inside the backpack can be doubled. It not only increases air circulation, but also allows your pet to stay in it more comfortably and move around more freely STURDY&SAFE STRUCTURE: Equipped with a firmly reinforced structure, to prevent the backpack from collapsing on your pet while traveling. When you open the top mesh windows to let your pet stick his head out, the safety rope inside can prevent your dog from running away COMFORTABLE TO WEAR: Comes with both waist and chest buckles, to give you extra support and maintain the stability of the backpack, prevents pets from slipping. The shoulder straps are equipped with extra thick padding for more comfort during long trips All Products From Us Have Undergone Strict Quality Checks. if There Is Any Quality Problem Or You Are Not Satisfied With The Product contact Us. we Will Give You The Best Solution.