Abstract: An extendable and expandable positioning structure of a trunk bag comprises a bag body and a movable buckling device at two sides of the bag. The bag body is divided into a bag receiving portion at the middle section thereof. The bag receiving portion has an upper bag at the upper side and a lower bag at the lower side. An inner side of the upper bag is connected to an upper box frame. The lower box frame is connected to a retaining plate and the retaining plate is installed with at least one long groove. The upper bag is connected to the sliding block. The sliding block is installed with a positioning male element at position with respect to the positioning female element so that the positioning male element is capable of being buckled to the positioning female element.

Abstract: A swivel wheel mounting arrangement includes two wheel mounts bilaterally fastened to the outside wall of the bottom panel of a travel bag to hold a respective pair of swivel wheels, the wheel mounts each having a mounting frame fixedly fastened to the outside wall of the bottom panel of the travel bag, two protruded portions horizontally bilaterally extended from an inner side of the mounting frame, and two hollow posts respectively integral with the protruded portions, a reinforcing lining mounted on the inside wall of the bottom panel of the travel bag and fixedly fastened to the hollow posts of the mounting frame, and two reinforcing bars bilaterally connected between the wheel mounts and closely attached to the outside wall of the bottom panel of the travel bag, the reinforcing bars having two distal ends respectively coupled to the hollow posts of the mounting frames of the wheel mounts.

Abstract: A rotational handgrip for baggage trailer comprises a main body having two hollow pipes on both sides thereof and two link connectors. The hollow pipes have receiving holes each housing a clamping bead, and the bead can be pushed outward. The two link connectors each has a plurality of clamping hole; and the two hollow pipes are pivotally arranged on the two link connectors such that the main body can be rotationally adjusted and the bead can be moved outward and fixed on the clamping hole to clamp the main body.