Adjustable waist buckle and widened shoulder strap design can effectively relieve pressure on the shoulder and back. Let yourself play happily with your pet! Not too tired. Made of cationic linen + breathable mesh, comfortable and breathable, to ensure your pet is not stuffy or uncomfortable in this small space. There is a large zipper on the backpack for easy entry and exit of animals. The opening is designed with a retractable rope. The maximum diameter of the opening is 15 cm and the minimum is 8 cm. You can adjust it according to your needs. There are two different ways to act. Put it on your chest, which allows you to communicate and interact with your pet and can ease your pet’s anxiety when traveling. Put it behind your back, it can effectively relieve fatigue caused by a long journey and make you more relaxed! Corresponding size advice: M - Suitable for pets weighing 2-3.5kg, L - Suitable for pets from 3 to 5 kg.