Abstract: A portable accessory container for mounting on a supporting structure, such as a rear wall of a hand-drawn wagon. The container comprises a receptacle portion for carrying articles and an attachment or mounting portion for attachment to a supporting structure, such as a vertical wall. The receptacle portion is preferably an open-top structure having a horizontal bottom wall and four vertical side walls, which may be either slatted or imperforate. The attachment or mounting portion may comprise either a pair of spaced hooks or an inverted U-shaped sheet attached to the receptacle portion. Either hooks or an inverted U-shaped sheet are adapted to extend over an upper edge of a rear wall of a hand-drawn. A container assembly comprising a container mounted on a wagon provides appreciably more storage space for articles than does the wagon alone. Various modifications and improvements are possible.