  We discuss the stability of strangelets by considering dynamical chiral
symmetry breaking. For quark droplets of finite volume, we formulate the
Nambu--Jona-Lasinio model with a basis set of the quark wave functions in the
chiral bag model. Chiral symmetry breaking for the finite volume bag is
discussed in a mean field approximation. Effects of the pion cloud including
the chiral Casimir effect are investigated. Physical quantities of the quark
droplets such as masses and radii are obtained for quark droplets of baryon
numbers up to five. We also apply our model setting to the nucleon and discuss
the stability of the quark droplets against nuclei.
