Expandable Design --- Our cat carrier backpack is designed with an expandable back which provides pet another space for activity, easily fits cats and most small dogs, weighing up to 17 lbs. Allow your pet to move comfortably and relieve anxiety. Breathable and Comfortable --- Well-ventilated design for optimal airflow, two-way access (top and front) for easy access, and removable mat for your pet to rest and relax. The top ventilated mesh of the dog backpack can be opened for your loved pet to stick their head out off. Hiking Friendly --- The widened adjustable shoulder strap meets ergonomically design. Furthermore, this pet backpack carrier comes with both waist and chest buckles to help distribute and balance the pet weight for a long trip. Safe & Multifunctional --- 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. Made of high quality polyester, this cat backpack carrier give your convenience while hiking, traveling, taking your pet to the vet or walking in the park. Pet Backpack Dimensions --- 13" L x 10.6 W x 16.5" H. Perfect for dogs up to 15 pounds, or cats up to 17pounds. Easily fits cats, small dogs, and most other small/medium-sized pets! Please measure your pet before purchasing - LENGTH: neck to base of tail, HEIGHT: floor to top of shoulder.