Hi Mazeman, i have a sabre sf 45 , i,m 5' 10", 12 1/2 stone, long back,short legs and the sabre fits me well. very comfy. like Agile say's there are better back systems.
i use this sack for two dayers,or if a day bimble i take my berghaus munro which is bombproof. well its not actually bombproof,but very robust.
The sabre sf 45 is an excellent sack,highly recommended.
cheers
WOKKA.:AR15firin