Description:[High-quality mesh fabric] environmentally friendly, non-irritating, breathable, let your pets feel at ease[Adjustable Shoulder Strap] Adjustable padded shoulder strap helps reduce stress, while the buckled retractable shoulder strap keeps the backpack stable[Interior Shoelaces] The internal buckle design is attached to the dogs collar to prevent your beloved pet from jumping out to keep it safe.[Extra Pocket] An extra double mesh pocket for perfect storage of small items, allowing your pen to communicate more with your pet.size:S-35x25x18 cm / 13.77 * 9.84 * 7.08 inches (for 4.41 lb / 2 kg or less);M-37x27x22 cm / 14.56 * 10.62 * 8.66 inches (suitable for less than pounds / 4 kg)L-43 * 34 * 22cm / 16.92 * 13.38 * 8.66 inches (less than 13 inches 22 lbs / 6 kg)Name: Pet backpackMaterial: Polyester