As title, 40% off duffbag MTB kit bags
http://www.duffbag.com/blog/2011/10/26/duffbag-kit-bags-ideal-for-wet-or-dirty-kit-mountain-biking-surfing-winter-sports/
I ride both road and mtb and try and acknowledge most other cyclists. The roadie acknowledgement tends to be a bit more subtle, just a nod of the head or a small wave. With MTB if on the trails more likely to stop and chat.
BUT
If you are on the tail end of a 100 mile chain gang and...