【Size Selection Recommendation】 Size S: Length 11.8 inches (approx. 30 cm), Width 7 inches (approx. 18 cm), Height 9 inches (approx. 23 cm), suitable for cats weighing under 7 pounds (approx. 3 kg). We strongly recommend this size for cats weighing less than 7 pounds (approx. 3 kg). (Due to the small size of this backpack, it is more suitable for cats. It is only suitable for a small number of small dogs or puppies. Dog owners should choose this size with caution!!) 【Newly Upgraded Materials】To address the issue of pets getting stuffy in backpacks, PUUROF has launched a dog backpack made with durable 600D Oxford cloth. The front of the backpack features a large mesh design to increase breathability, and it also includes a windproof curtain to block out cold winds and sunlight, making it convenient for outdoor activities with your pet in all seasons. This backpack is breathable, comfortable, and allows your pet to peek out and enjoy the scenery, while also facilitating interaction with their owner. 【Double Safety and Stability】1. Built-in safety buckle prevents pets from escaping; 2. Drawstring design enhances safety and facilitates interaction with your pet. The built-in removable hard base plate with high-density pearl cotton provides a comfortable fit, prevents sagging, and is easy to clean. 【Two Wearing Options】The PUUROF hands-free dog backpack on the front or back. The ergonomically designed shoulder straps scientifically distribute pressure points, comfortably protecting the lumbar region and reducing strain on the owner's shoulders and back. The waist and chest straps provide additional support to prevent the dog from falling. 【Solving Pet Outdoor Challenges】 Most pets experience stress and anxiety outdoors. Some puppies also struggle to stay out alone for extended periods. This pet backpack is designed to keep you closer to your pet and enhance their sense of security when you take your cat or dog out. Take them with you to explore the world! The PUUROF chest bag is inspired by the carrier and modified to fit the pet's body type. Parents who want to take pets on outings can really try this backpack, in addition to freeing up the hands, handing over and dispersing the weight of the pet with the shoulder strap will feel supported by the waist and shoulders, and will not feel back pain for a long time, the front design can give the pet a complete trend, the pet in the bag like a mother's arms, relieving anxiety. The package body is spacious, the bottom has hardness to support the pet, standing and sleeping carefree, comfortable and comfortable, there is no small storage space on both sides of the bag to accommodate most of the picnic supplies. Whether shopping, cycling, are very convenient, easy to travel with bags!