【Recommended for 5 books＜ small dog＜ 18 books】: Dog carrier backpack is designed for carrying small dogs. We strongly recommend it for puppies under 18 pounds. If you have any doubts about the size, you can contact customer service in advance. 【Careful design down to the smallest detail】: Paw and tail hole design ensures your pet is safe and comfortable. Velcro, zipper and elastic opening allow you to keep your dog in it comfortably. Quick release buckles at the end of the straps ensure quick, one-handed installation. 【Customer experience above all】We always support our customers and try our best to meet your needs. We have made several upgraded improvements such as thickening the shoulder sponge and using improved breathable mesh and polyester fiber material, which makes the tote bag more durable and comfortable. 【Two carrying options】: The hands-free pet bag can be worn in the front or back as you like, it brings you closer and increases your pet's sense of security when carrying a