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We examine the baryon content of low-mass {\Lambda}CDM halos$(10^8<M_{200}/{\rm M_\odot}<5\times 10^{9})$ using the APOSTLE cosmologicalhydrodynamical simulations. Most of these systems are free of stars and have agaseous content set by the combined effects of cosmic reionization, whichimposes a mass-dependent upper limit, and of ram pressure stripping, whichreduces it further in high-density regions. Halos mainly affected byreionization (RELHICs; REionization-Limited HI Clouds) inhabit preferentiallylow-density regions and make up a population where the gas is in hydrostaticequilibrium with the dark matter potential and in thermal equilibrium with theionizing UV background. Their thermodynamic properties are well specified, andtheir gas density and temperature profiles may be predicted in detail. Gas inRELHICs is nearly fully ionized but with neutral cores that span a large rangeof HI masses and column densities and have negligible non-thermal broadening.We present predictions for their characteristic sizes and central columndensities: the massive tail of the distribution should be within reach offuture blind HI surveys. Local Group RELHICs (LGRs) have some propertiesconsistent with observed Ultra Compact High Velocity Clouds (UCHVCs) but thesheer number of the latter suggests that most UCHVCs are not RELHICs. Ourresults suggest that LGRs (i) should typically be beyond 500 kpc from the MilkyWay or M31; (ii) have positive Galactocentric radial velocities; (iii) HI sizesnot exceeding 1 kpc, and (iv) should be nearly round. The detection andcharacterization of RELHICs would offer a unique probe of the small-scaleclustering of cold dark matter.

The properties of "dark" {\Lambda}CDM halos in the Local Group