Abstract: Sterilely enclosing a container by means of at least two caps by: gripping a first region of a container provided with a first cap in a first region by means of first tongs, by gripping and clamping the first cap; and sliding a second cap onto a second region of the container in such a way that one or more of: the second cap abuts the first cap, the second cap slips over the first cap, or the second cap is slipped over by the first cap; or the first cap and the second cap are connected by means of complementary screw threads, protrusions, cut-outs, or engagement elements; or a connection that provides sterile sealing-off from the outside of the first and second caps can be formed between the first and second caps, leaving a bridgeable distance between the first and second caps.