Bought my tank bag at the BMF rally yesterday. I went for the Bagster/Baglux Sherpa, a two tier model with about 40 litres storage capacity. The top bag has a zip that doubles it's capacity. However, this makes it too tall to be practical if used with the other bag on the ST2
First impressions riding home were:
lower half of clocks and temp/fuel gauge not visible
much less engine / road noise
more noticeable wind buffeting on shoulders
at 100mph the wind turbulence made my helmet shake which blurred my vision slightly
The bags look good quality and sat well on the bike. The lower bag doesn't have a map pocket though maybe one can be zipped on, that said why not just use the top bag instead?