Abstract: The bicycle stem structure includes a mounting seat, a housing, and a vertical pipe. The housing includes a first connecting member extending toward a front wheel and a second connecting member extending toward a rear wheel. The vertical pipe is located in the first through hole. The vertical pipe is spaced apart from an inner wall of the first through hole and forms an annular cavity in communication with the second through hole. The vertical pipe is provided with a third through hole along an axial direction thereof. The mounting seat is connected to the vertical pipe and provided with at least two cable through holes through which cables are passed. At least one cable through hole is in communication with the third through hole, and at least one cable through hole is in communication with the annular cavity.

Abstract: A luggage case for children includes a case body and a case lid portion installed on the case body, wherein the case body is provided with a first and second case board, a fixing member, a support column, a magnetic buckle, a drawstring set, a wire rope, a rivet and a metal ring fixedly connected to the wire rope, the first and second case board fixedly connected to the fixing member through the rivet, the rivet fixedly connecting the support column to the first and second case board, the magnetic buckle provided with a base fixedly installed on the first case board and a drawstring buckle, the second box board provided with a clamping slot, and the drawstring set fixedly installed in the clamping slot, wherein when the metal ring is engaged with the drawstring buckle, the luggage case is capable of being towed or shoulder-carried by the wire cord.