Durable & Large Size: This dog backpack is made of eco-friendly polyester, wear-resistant and scratch-resistant. The M Measures approximately 30x 24x33cm, Recommend for pets up to 7kg .The L Measures approximately 45x36x31cm, Recommend for pets up to 15kg(Please measure the size and weight of your pet before purchasing this product). Fits most small, medium sized dogs and cats. Providing roomy space for your pet to stay comfortable during the trip. Easy Interaction & Super Ventilation:The dog carrier backpack has one big entrances to facilitate pets in and out and interact with the owner. This ventilated mesh design can not only ensure the normal circulation of air in the pet's backpack but also effectively help pets reduce anxiety and facilitate their observation of the surrounding environment. Breathable & Labor-saving Back Design: This cat backpack thickens the back and shoulders to make it more supportive; the entire back of the pet backpack is ergonomically designed to minimize the pressure on the back of the cat carrier backpack. Shoulder straps, waist straps and chest straps can be adjusted; it is recommended to adjust them to the most comfortable state during use, which helps to reduce back load and increase comfort. For Your Convenience: In addition, this dog backpack can be folded, and when not in use, it can be folded and stored to save space.