Easy travel, breathable and not tight, ergonomic design to protect the spine, comfortable protection of the spine, scientific distribution of force points, triangular force scientifically distribute the force points to the waist, back and shoulders. Prevent lumbar injuries caused by long-term back. The waist and shoulder belt can be adjusted to add a waist belt, which is stable and comfortable, and the force is evenly distributed. Travel will be more labor-saving and relaxed. The bottom is widened to design the pet without the legs, and the tail position is reserved. The tail can swing freely.