1) Product Size This dog walking backpack comes in 3 sizes, suitable for small to medium sized cats and dogs. Please be sure to measure your pets chest circumference and front and hind legs before purchase, then choose the correct size dog walking bag according to the size chart. 2 ) 5-hole design. The belly bag for small to medium sized dogs has 5 holes to allow the pets limbs and tail to be exposed so they dont feel cramped. The pets arms and legs can be stretched to make the pet feel comfortable and relaxed. 3) High quality. The small and medium dog travel bag is made of canvas fabric, which is durable and easy to clean. The front of the small and medium dog travel bag is made of mesh design, which is cool and breathable and wont feel stuffy. Delicate and delicate stitching will not damage your pets fur and skin. 4) Safety. Zippers on both sides of the dog accessory travel bag make it easy for your dog to put it on, and safety hooks that hold the pet collar in place ensure your pet wont jump out. The shoulder straps can be adjusted in an X shape to prevent the hiking dog backpack from slipping off the shoulder. 5) Wide range of use With this hiking dog backpack small to medium size, you can easily take your pet on a bike, run errands, in the car or to the vet. If you have any questions about our products, please do not hesitate to contact us. We will do our best to solve your problem.