  Radio bubbles, ubiquitous features of the intracluster medium around active
galactic nuclei, are known to rise buoyantly for multiple scale heights through
the intracluster medium (ICM). It is an open question how the bubbles can
retain their high-energy cosmic-ray content over such distances. We propose
that the enhanced scattering of cosmic rays due to micromirrors generated in
the ICM, as proposed recently by Reichherzer et al. (2023), is a viable
mechanism for confining the cosmic rays within bubbles and can qualitatively
reproduce their morphology. We discuss the observational implications of such a
model of cosmic-ray confinement.
