Need a new one as I seem to have split the material next to the zip on my current one, stuffing to much kit in it..
Currently I'm using a Deuter one, can't remember the model but it used the aircomfort system which uses a mesh to keep the bag away from your back - I really like this system (vaude use it, and like the berghaus freeflow bags).
Needs around 14-17 litres of capacity (the deuter extended), but the 20ltre berghaus freeflow look too massive for 'regular' riding...
Why the need for a larger bag... because all my m8's use me as a mule (one jokes, his bag has a note inside it saying "it's in Paul's bag") and I like being self suffient when out alone.
Lezyne smart pack from merlin - reduced to £30
I was using a Berghaus freeflow for my commute until I went to a Carradice saddlebag (best move ever) I found the thing just didn't sit right for cycling. It pressed on my neck and restricted my ability to look over my shoulder to check for cars (v dangerous really) I wouldn't bother with it personally.
wingnut, but they are hard to find and expensive.
I like my Vaude with mesh back, but it has developed an annoying squeak near my ear which is very annoying.
old n trusted camelbak. i've still got one which has been going strong for aaages.
looking at the wingnut, but their capacity seems a bit low, but otherwise it must have the mesh back
EDIT: **** in hell, didn't realise the wingnuts were 'that' expensive!