Size: 42*33*28CM Ergonomic Design - Pet backpack carrier with extra thick pad on adjustable shoulder strap and back increases comfort,reducing load.Chest and belly strap of the cat carrier backpack prevent shoulder strap deviation and maintain the stability,distributing the weight and balance load for long walking, traveling, riding, sightseeing, camping, hiking,biking and other outdoor activities especially. Ventilation & Visibility -This pet travel carrier has side and top entrances which make your pet easy to stick their head out out. You can feed or play with thim without putting the puppy travel bag down. And the three breathable mesh windows are designed for visibility and air ventilation. The front transparent sheet lets more light in. Pets can have a good view of the surroundings and breath freely during journey, feeling relaxed and peaceful. Safe and Humanized Design -Dog backpacks are equipped with a firmly reinforced structure.Safe metal anti-escape zip and a built-in leash prevent your naughty friend from escaping.Front and side pocket provide more space to store mobile phone, wallets,dog and cat essentials.Short plush padding for your pet to sit or sleep on comfortably. It can be removed and washed separately! Qualified Construction -Dog carrying backpack , made of high-quality durable coated oxford cloth and nylon mesh, is water resistant,anti-scratch,eco-friendly,non-toxic and non-irritating,letting your pet fit comfortably and join the trip.Besides,this expandable pet backpack is one-piece zipped design, easy to expand and fold for storage.