Hey mate, that pack looks pretty good already, seems like RS have seriously improved their packs. I really like that they have even added the red canvas back support straps.. with the white shoelaces, what a nice addition!
Is that frame made of aluminium?
The bottom bend in the frame looks about right, I am afraid you will have to get used to the bottle scratching your butt same on my pack with a real Karrimor.
I am still not completely happy with that colour though... seems a wee bit too bluish.