  Magnetic skyrmions are topologically nontrivial spin configurations that
possess particle-like properties. Earlier research was mainly focused on a
specific type of skyrmion with topological charge Q = -1. However, theoretical
analyses of two-dimensional chiral magnets have predicted the existence of
skyrmion bags -- solitons with arbitrary positive or negative topological
charge. Although such spin textures are metastable states, recent experimental
observations have confirmed the stability of isolated skyrmion bags in a
limited range of applied magnetic fields. Here, by utilizing Lorentz
transmission electron microscopy, we show the extraordinary stability of
skyrmion bags in thin plates of B20-type FeGe. In particular, we show that
skyrmion bags embedded within a skyrmion lattice remain stable even in zero or
inverted external magnetic fields. A robust protocol for nucleating such
embedded skyrmion bags is provided. Our results agree perfectly with
micromagnetic simulations and establish thin plates of cubic chiral magnets as
a powerful platform for exploring a broad spectrum of topological magnetic
solitons.
