【Safety】Petsfit cat backpack carrier is made of high-quality Oxford cloth, scratch-resistant, environmentally friendly, non-toxic, non-irritating, allowing your pet to breathe freely; the extension part adopts a self-locking zipper design to prevent pets from opening the zipper. The built-in safety rope can prevent pets from escaping. Dimensions Product size :13.8"Lx11"Wx 16.5"H, Expanded size: 24.3"Lx10.2"Wx14.2"H. The patented expandable back design (Patent Number:US10743515B2) provides good air circulation and adds extra pet's activities and rest space to reduce his anxiety. Perfect for cats, small dogs, and other small animals up to 22 pounds. Please measure your pet to ensure whether cat backpack carrier suitable for him or not. 【Super Breathable & Multiple Openings】The 4-sided mesh windows not only ensure the air circulation in the cat backpack carrier, but also allow you to easily observe the pet's activities and interact with him. There are zipper openings on the top of the bag and on the side of the expansion. You can easily put your cute pet into our pet backpack carrier.