Pecute Pet Carrier Backpack, Dog Carrier Backpack, Expandable with Breathable Mesh for Small Dogs Cats Puppies, Pet Backpack Bag for Hiking Travel Camping Outdoor Hold Pets Up to 17 LbsDIMENSIONS OF PET BACKPACK : Before purchasing, please measure the dog's sitting height (from front legs to the top of the head) to ensure that the dog's sitting height is within the recommended range, otherwise it may be too large or too small; L size: 17. 4*13. 4*10. 6in, suitable for cats less than 15. 4lbs; for dogs less than 13lbs and sitting height 15. 6"; XL size: 19. 3*15. 7*12. 9in, for cats that 15. 4lbs~24lbs; for dogs 13lbs~22lbs, and