With the improvement of people's consumption level and the diversification of travel modes, the traditional luggage case design can no longer meet some needs of users for short-distance travel, and the traditional luggage case still has problems such as excessive volume, inconvenient carrying, and single shape. According to this, on the basis of market and user research, through a large number of sketches to find solutions and product function diversification considerations, the final product renderings. Functionally, through the innovation of the tie rod, the tie rod can rotate in the vertical direction when it is pulled to the end, which can reduce the force on the wrist while dealing with people of different heights, thus saving more effort in the use of luggage case. And due to the structure of luggage case and the innovation of shell materials, users can sit on luggage case and rest when there is no seat.