A method and a device for handling containers is described, wherein the containers are transported along a predetermined transport path and combined with at least one other product, the amount of which can be determined, in such a way that the product is fed to each individual container in a predetermined feed area of the transport path, wherein the other product is routed along a feed path to the feed area. At least one characterizing state is determined in a detection area disposed upstream relative to the feed area in a direction of transport of the containers, the state being characteristic of a number of containers fed, and a residual amount for the product that remains to be fed to the predetermined feed area until the product is switched is determined as a function of this characteristic state.