Weight [Recommended for 5lbs < Small Dogs and Cats < 20lbs] Pet Travel Backpacks are specially designed to carry small dogs/cats, our shop recommends puppies less than 20lbs (larger dogs may bring too much weight to the owner more burden). Please measure your pet and choose according to the size chart. Pet carrier backpack, designed to fit your pet's body. The zipper design on both sides makes it easy for you to wear it for your pet. The built-in harness hook can be attached to the pet collar, making your pet more secure in the pack. Designed with pet legs and tail exits to make your pet more comfortable. The pet-carrying backpack can be worn on the front or the back: when you wear it on the front, you can walk and interact with your pet to enjoy each other's happiness. When worn on the back, you can take your pet to run, ride and climb more easily. This product is made of breathable cotton and polyester fibers for durability and comfort. With elastic design around the neck of the pet backpack, it can provide enough flexibility and comfort. This cat and dog backpack is lightweight and portable, you can use it to carry a small dog or cat for biking, hiking, camping, mountain climbing, outings. I'm sure you and your pet will be satisfied with this backpack.