O.K. Lets get the obvious comparisons going. Does anyone have any of the new Sierra Designs Flex series bags and how do they compare in the real world to Montbell? Years ago i almost bought one but went with a lighter bag to save weight. It seems Sierra Designs has seen how popular the Montbell bags have become and decided to bring them back, only at a better price point than the Montbell bags! What do you guys think?