If you're not going to load them up with books or something else heavy, toggle bolts into the sheetrock will work. Drilling toggles into the metal studs will be a PITA. For clothes and the like, a toggle every 12" to 16" should be plenty.
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I started out with nothing & I've still got most of it left
M60 VP160 QS8 EP350
M22 VP100
Algonquins