Abstract: A liquid decanter includes a collapsible container, a cylindrical outer casing enclosing the container, a piston rotatable upwards and downwards in the container and a transparent pouring neck. The piston has an outer handle and external screw threads meshing with internal screw threads on the casing. Hence the container can be collapsed and expanded, and the liquid level and hence the amount of air in the container and neck can be observed through the transparent neck. The neck has a simple screw-thread connection with a disk secured to the upper end of the casing. The neck is terminated by a valve and pouring spout. The liquid is poured into the wide opening of the disk.