I've had this pack for nearly a year now and used it in all conditions.
I first tried it out on the South West Coast path wearing just a short sleeved shirt and found it quite uncomfortable as the padded hip section rubbed quite a lot and I found myself fiddling with it everytime I tried.
I then tried it out in the Scottish Highlands which was a little colder so I was wrapped up better and felt it a lot more comfortable.
The Freeflow back system is excellent in warm weather and even though my back did get wet in te warm weather it didn't stay wet for long (this is also a good place to store your map)
It has plenty of compartments/pockets (6 in total) which is very handy for keeping certain things seperate ie food/waterproofs etc...There is a top and bottom entrance which again makes sorting your pack out a lot easier. It has an excellent waterproof cover which I have tried in some very heavy downpours and the pack has stayed totally dry, though it didn't stretch right over my poles which can fit to the back via velcro straps.
It also a compartment for a hydration bladder which will just about take a 2litre one. There are 2 small pockets on the side which are handy for a camera or gps but are not deep enough for water bottles.
To Conclude:
Good Points::
Lot of pockets
Great Freeflow system
Waterproof Cover
Pole holders
Bad Points::
Can be hard to get comfortable (Though I have finally got mine ok now)
2 small bottle pockets are no good for bottles
On a whole I would recommend as you can get these for approx £40 now and there isn't much better for that price.
(Written by: robdaphunk)