【Extra Large Size – Holds up to 40 lbs】Measures 23.7”L × 15”W × 16”H, this is one of the largest soft pet carrier backpacks with wheels on the market. It supports all size cats and offers enough room to hold 1–4 cats comfortably. The rolling cat carrier can also fit 1 small dog up to 25 lbs, or rabbits and other small animals under 30 lbs, making it a perfect multi-pet travel carrier for daily outings or vet visits. 【Upgraded 6 Wheel Platform for Easy Mobility 】The cat backpack carrier with wheels features 6 silent spinner wheels and a push-button telescopic handle that adjusts to different heights for any pet owner. It provides smooth 360° movement and effortless rolling through streets, malls, and supermarkets, eliminating the need to carry heavy loads by hand. Ideal for travel, vet trips, and shopping. 【Stronger Materials & Reinforced Construction】Crafted from high-density Oxford fabric with reinforced stitching, this durable pet travel backpack supports up to 40 lbs without collapsing. The thickened aluminum alloy frame and 6-wheel base enhance stability and longevity, offering superior load-bearing performance compared to most soft-sided pet carriers on the market. 【Excellent Ventilation & Visibility 】Designed with 4 large breathable mesh windows, this ventilated cat travel backpack ensures your pets stay cool and relaxed with plenty of airflow and visibility. The top zipper opening allows easy access for loading or comforting your pets, while the side mesh pocket offers convenient storage for treats, leashes, or small supplies. 【Measure Your Pet Before Purchasing】Ideal for all size cats and small to medium-sized dogs up to 25 lbs. Since weight alone can be misleading, please measure your pet’s height and length before ordering. Refer to the size chart in the images for guidance. This large rolling pet carrier backpack is not airline-approved due to its oversized design but is perfect for car travel, vet visits, and outdoor adventures. At HOVONO, we focus on the differentiated needs of you and your pets, and are committed to bringing you a high-quality experience and a convenient lifestyle. The HOVONO pet carrier with wheels features extra large size and 6 silent spinner wheels, great for cats of all sizes and small dogs.