Why Choose Our Pet Carrier Backpack Easy To Operate: Easy In And Easy Out, Very Convenient With Zipper And Hook And Loop On Both Sides Of The Backpack, Convenient Pet Wear And Take Off Breathable: Plenty Of Mesh Area Provide Adequate Ventilation And Keep Your Pet Cool Comfortable: Sturdy Fabric With Sponge Padding Ensures Durability And Provides Comfort For You And Your Pet Adjustable: Adjustable Strap Helps You To Balance Weight And Makes It More Comfortable Wear The Neck Elastic Can Adjust The Size According To The Dogs Or Cats Neck Considerate Design: Fabric Covered Elastic Provides Some Flexibility And Gentle Support To The Pet Suitable Openings For Legs And Tail&Nbsppackage Content:&Nbsp1X Pet Backpack (No Retail Box Packed Safely In Bubble Bag)&Nbspnotice: The Canvas Carrier Hasnt Elastic, So We Suggest You To Choose The Bags Size Bigger 3-4Cm Than The Recommended Bust Size For Example, If Your Pets Bust Size Is 28Cm, Avoid To Any Unfit, We Suggest You Choice The M, Not S One