  Bound states, such as $qq$ and $q\bar{q}$, may exist in the Quark Gluon
Plasma. As the system is at high density, the volume of the bound states may
evoke a reduction to the phase space. We introduce an extended bag model to
investigate qualitatively the volume effect on the properties of the system. We
find a limit temperature where the bound states start to be completely melted.
