Abstract
Cosmic balloons, consisting of relativistic particles trapped inside a spherical domain wall, may be created in the early Universe. We calculate the balloon mass $M$ as a function of the radius $R$ and the energy density profile $\ensuremath{\rho}(r)$, including the effects of gravity. At the maximum balloon mass $\frac{2GM}{R}\ensuremath{\approx}0.52$ for any value of the mass density of the wall.
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