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We discuss the quark condensate of the vacuum inside the baryon. We analyzethe 1+1 dimensional chiral bag in analogy with the realistic 3+1 dimensionalone. The Nambu--Jona-Lasinio (NJL) type interaction is used to investigate thequark condensate in the chiral bag. Considering the strong meson-quarkcoupling, we solve the mean field solution to the scalar and pseudoscalarchannels by including the chiral Casimir effects. The self-consistent equationallows a finite value of the quark condensate and hence a finite dynamicalquark mass inside the bag. It is shown that an approximate Cheshire Cat pictureholds for massive quarks

Quark condensates in the chiral bag with the Nambu–Jona-Lasinio interaction