In reply to purplemonkeyelephant:
I'll second Adam Turner about on the Under Armour boxers - I use the Original 9" ones.
Put those as first on skin, so under the leggings or anything else you are wearing.
On multi days I take 2 pairs, rotate between them: wear one, wash the other and let dry, that way each gets 36 hours to dry. also wear a looser PJ's bottoms (or nothing) at nights.
Also make sure to regularly clean everything down there - pack a thick 1 gallon ziplock bag for a little basin, with a bit of soap to do the cleaning. a buff to dry it all and you are set - feel fresh at all times!