The invention refers to the field of air transport systems for plastic vessels equipped with a projecting collar, and in particular refers to a device equipped with guides (10) and (11) for the vessel body (2) that provide for adjusting means (18) of the vertical guide position with respect to a sliding lane of the bottle collar and adjusting means (19) of the horizontal guide position with respect to the vertical vessel axis. The adjusting means can be simultaneously driven through a processor in which characteristic dimensional data of various vessels are entered.