  Skyrmion bags are composed of an outer skyrmion and arbitrary inner
skyrmions, which have recently been observed in bulk chiral magnets, but still
remain elusive in magnetic films. Here, we propose a method of creating
skyrmion bags in a thin-film nanodisk, which includes three steps. Firstly, the
size of outer skyrmion is enlarged by a vertical magnetic field, then inner
skyrmions are nucleated at an off-center area by local current injection, and
the system is finally reconstructed due to multiple inter-skyrmion potentials.
Thus, skyrmion bags with topological charge up to forty can be created.
Simulated Lorentz transmission electron microscopy images are given to
facilitate the experimental demonstration. Our proposal is expected to inspire
relevant experiments in magnetic films, and pave the way for potential
spintronic applications based on skyrmion bags.
