【 EXPANDABLE & FOLDABLE 】 This pet carrier with an expandable back design gives your pet more space (increase by 90%) to rest and increase air circulation, allows your pet to move around more comfortably and reduces the anxiety. When you don’t need to use it, the folded pet backpack will only take up very little space. Airline approved? Each airline sets their own specific requirements, so it is advised to check with your airline of choice. | 【 MAXIMUM AIR CIRCULATION & MULTIPLE ENTRANCES 】 Comes with 4-side breathable mesh windows, giving plenty of air for pets. Makes it easy for you to observe the movement of your pets while they are enjoying the scenery outside. With zippers on both top and front, your lovely pets can be put in and out of our pet carrier backpack easily. | 【 SHOCK ABSORPTION DESIGN 】 Honeycomb mesh elastic sponge back cushion, breathable, decompression and shock resistance, release pressure and travel easily. Widened design, adjustable shoulder pad to help reduce load and increase comfort, two retractable buckles on the top and bottom of the cat backpack to prevent shoulder strap deviation and maintain the stability of the dog carrier. | 【 SAFETY & STORAGE】 1, Made of high-quality oxford cloth, waterproof, anti-scratch, environmentally friendly, non-toxic and non-irritating, let your pet breathe freely and relax. 2, Adopts lock-type zippers design to prevent the zipper from being opened by pets. Built-in retractable hook safety rope with anti-escape zip to prevent pets from escaping. 3, The pockets on both sides can store food and trash bags and some necessary accessories, like snacks, keys, cards or mobile phones and so on. | 【 STURDY & COMFORTABLE BOTTOM - DOUBLE-SIDED USED 】 The dog backpack has a removable firm bottom that can be unzipped and features soft, comfy padding for your pet to sit or sleep on comfortably. It can be used on both sides: the bottom mat is made of short plush. In the winter, pets can stay indoors to stay warm and comfortable; the other side is oxford-cloth design, suitable for summer, cool and breathable! It can be removed and washed separately!