A device for holding a container in a container treatment device, for example for holding a bottle at the bottle neck thereof, includes a first clasp arm, which is arranged on a clasp carrier so as to be pivotable about a first pivot axis, and a second clasp arm, which is arranged on the clasp carrier so as to be pivotable about a second pivot axis. The first clasp arm is of longer design than the second clasp arm. The first clasp arm and the second clasp arm are pivotally coupled to one another via a coupling arrangement, wherein the clasp arms are magnetically preloaded into a closed position, and the clasp arms can be opened to receive a container passively by inserting the container. A treatment device for treating a container is also described.