I am not just saying this from a Sales point of view,  but this Rucksack is the Cats  whiskers..!!
I have had it quite a few years, but never actually been camping with it.  I think once I may have used it for a weekend away in a wooden lodge / Centre parcs type of place.  
It is pretty large in size,  with an Optional / Removeable metal frame at the back, Removeable adjustable Padded shoulder straps and also lower back / hip area fastening.
 Note **All the straps mentioned. are fully adjustable.  
As for the Capacity,  I presume it must be at least 35 L,  As there are two zips down either side of the rucksack, which allow it to expand out to double its original size - if required.
There are four pockets,  One two way zipped hidden top cover pocket,  two stretchy lower side pockets, One hidden valuables slim pocket, and then the main inside area, with nylon top pull cover - to keep everything dry.  
 The Rucksack is Black and Dark Grey, with a Beige trim, and orange elastic zip pulls. It is extremely smart, and in Mint Condition..
Length is approx - 23 inches
 Width is approx  -  16 inches 
 Weight (incl metal frame) - 1.5 kgs