PAWZ Road Pet Cat Carrier Dog Travel Backpack Rucksack Breathable Carrying Backpack in 3 Sizes 7 Colors Size: Distance between front and hind legs Size S: 4.3" inch,suitable for pets below 5.5 lb Size M: 5.1" inch,suitable for pets below 8.8 lb Size L: 6.2" inch,suitable for pets below 15.4 lb Zipper and Magic stick design on both sides, easily for puppy to wear.Breathable grid design, dog will not feel hot in summer. Elastic design in the neckline, can adjust it and make the pets more comfortable feelings.Ventilate grids on both sides, and a hole for tail, pet would not feel stuffy There are fixed collar buckles inside, make pets security. You can take your beloved dog together anywhere and anytime when you want with the dog front carrier/ dog backpack carrier. Please notice the Size. Normally it will take 8-12 days delivered,you can also choose the expedited service 3-5 days delivered