Yes, the Wolfman Enduro is small, but its a cracking little bag if you pack carefully - ask yourself, do you really need more than 6 litres of gear easily to hand?
Biggest benefit I've found of a small bag like this (over others I've tried) is that you get full access to the tank filler without any fannying about unzipping, unclipping or unbuckling anything.
Read
this thread.