I've often wondered why you don't see a portable oxygen solution for purposes of helping mtn riders "recover" faster from those big stucks etc. Any reason why something like this would not work? Would it help you recover faster? Would it be safe to carry in a back pack? I sent an email to the mfr with these questions as well but appreciate your thoughts.
http://www.mhoxygen.com/index.php?o...ortable-o2&catid=4:emergency-systems&Itemid=6
http://www.mhoxygen.com/index.php?o...ortable-o2&catid=4:emergency-systems&Itemid=6