  We describe the simplest example of an instanton bag in Euclidean space. It
consists of a monopole wall and a Kaluza-Klein monopole wall, lifted to one
higher dimension, trapping the instanton charge in the middle. This object has
finite instanton density in a three-dimensional volume.
  Baryon physics in holographic QCD models gets translated into a
multi-instanton problem in the bulk, and a state with a high density baryonic
charge consists of a non-diluted multi-instanton solution. The instanton bag is
a good candidate for this high-density state. We compute its parameters via
moduli stabilization. Chiral symmetry restoration is exhibited by this state,
and it is a direct consequence of its non-diluted features.
