LaTeX line spacing FAQ: How can I control the line spacing in itemize and enumerate tags?
What I did was to create my own LaTeX command, and then use that command instead of the traditional enumerate tag. (This works just as well for the itemize tag.)
The LaTeX example below shows how to create your own command named
packed_enum. After you define this command, just use it instead of enumerate or itemize, and your line spacing will essentially be reduced to single line spacing.