A travel bag includes a bag body defining a front open side, a cover panel covered on the front open side of the bag body, a first zipper joining the cover panel and the bag body, a locating panel mounted in a center opening in the cover panel, a connection frame stitched to the locating panel, a sub cover panel hinged to the bottom side of the connection flap, a second zipper joining the sub cover panel and the locating panel, a partition panel set in a center opening in the connection frame, a third zipper joining the connection frame and the partition panel, and two fan-like expandable side flats bilaterally connected between the connection frame and the sub cover panel.