[Recommended for Small to Medium Dogs/Cats Under 35 lbs] To ensure the right fit, kindly measure your pet and refer to our size chart. Pay attention to the and of the pet before purchase. 3 Sizes are available for Your Beloved Pet, If your pet's back length requires size S but the girth requires size M, please choose size M. Additionally, leave at least an extra inch to ensure your pet's comfort..[Safe & Comfortable]Our straps are designed with zippers + buckles, which are r and more comfortable than zippers + Velcro. They prevent pets from slipping and being scratched by sharp Velcro. The neck of the pet is elastic and can be adjusted according to the thickness of the neck..[Two Ways of Wearing]: A hands- pet carrier can be worn on your front side or your backside if you like, it keeps you closer and increases pet's sense of security when you carry your cat or dog around. Meanwhile, we include an optional backpack anti-slip shoulder strap with the bag, which you can attach to the carrier to prevent the shoulder strap from slipping away when you ride a bicycle with your pet on your back..[Legs-out and tail-out Design]: Legs-out and tail-out design keep your pet and comfortable; A tail hole is reserved for pets, so that they can swing their tails at any time to reduce discomfort; the four leg holes also reduce the feeling of being trapped for pets, making it easier for them to stretch their limbs..[ Have fun with Your Pets]: Our lightweight and breathable dog front carrier backpack allows you to travel with your pet without feeling burdened. Whether it's biking, hiking, camping, or other more fun outdoor activities without hurting your pet's knees or waist. It allows you and your lovely pets to have more adventures together.