1. Collapsible & Expandable- The pet backpack with a large expandable back that gives your pet more room to move around and effectively reduces their anxiety when you don't want them to walk anywhere. Collapsible design helps you to save space when not in use. 2. Breathability & Visibility- There are tear-resistant breathable mesh on the front and 2 sides of the carrier backpack to maximum air circulation for your pet. The top of the backpack can be opened, for your cat/dog to stick their head out off. 3. Suitable size-size: 12 x9.8x 11.4inches, Fits the pets under 20 LB, like most cats, small dogs, rabbits. The best pet backpack for traveling, hiking and walking with your small furry friend. 4. Sturdy & No Plastic- Made of 100% premium Oxford fabric (without any inferior plastic), waterproof, anti-scratch, non-toxic and non-smell, let your pet breathe freely and relax. We have newly added a removable and washable reinforced bottom board and a pad with dual sided, one furry side for winter and the other side for summer. 5. Ease Control & Safety-Built-in safety rope to attach to your pet's collar prevent pet escaping when open the pet backpack. Zipper is made of high quality metal with a anti-escape buckle to prevent pets from escaping.