Loop through values assigned to Enum var (using [Flags])

So I've got an enum (below) and I'm making a custom inspector for a script which has some PropFlags variables. The custom inspector uses an EnumMaskField to allow assigning multiple values to each var in the inspector. It works just fine, and I can use myPropFlags.HasFlag() or bitwise voodoo to check against one type at a time.

     [Flags]
     public enum PropFlags : int
     {
         Environment  = 1,
         Hazard         = 2,
         Agent         = 4,
         // and so on
     }

I'd like to loop through each value assigned to myPropFlags (not each value in PropFlags, but each value assigned to a PropFlags variable). I've seen a few threads on ways of doing this, but the solutions look costly and none are things I know how to implement myself.

How should I do this? My amateurish instincts tell me to use a list or array of PropFlags and abandon the convenience of using EnumMaskField in the inspector. Given speed is far more crucial than convenience, what's my best option?

Thanks for reading!