SAFETY AND COMFORT: This pet sling bag features an adjustable safety hook that connects to your pet's collar and two buttons on the mouth of the bag, preventing your pet from accidentally falling off. Two Sizes: M: 40 x 10 x 22 CM. Recommended for animals up to 2.5 kg. L: 47 x 14 x 29CM. Recommended for pets 2.5-5.0 kg. More size information, please check our size chart. Premium Material: This pet backpack is made of soft and breathable mesh fabric, soft and flexible, highly breathable, comfortable and not stuffy for your beloved pets. This portable pet bag can be hand or machine washed It allows you to easily solve all stains without worries. Adjustable Opening: The adjustable opening is convenient to adjust according to the size of the pet's neck, thus playing a role in protecting the pet. Plus, the adjustable drawstring closure lets your pet keep their head out to enjoy the fresh air and beautiful scenery. Convenient: The shoulder strap can be easily adjusted according to your height with a simple buckle, which is universal for different people. Plus, with a side pocket on the adjustable shoulder strap, it's very convenient for storing a phone or other small items.