For 2013, Patagonia has brought back the Houdini pants. At 3.1 oz (listed), these aren't the lightest wind pants available but I do love them. Take note of the unisex sizing. I normally wear a medium for Patagonia pants and shorts and chose to go with medium to layer over shorts. The pants fold into the one zippered pocket included on the rear. There is a small looped drawstring included as well but I haven't figured out to make use of it yet. Like the old Model T, you can have any color you like so long as you choose black.
http://www.patagonia.com/us/product/houdini-pants?p=24130-0-155
