backpack searcher

Hello, everybody! Who know, where to buy old model of swedish backpack ( http://www.surplus.s...e0394a2ebec.jpg ) in Stockholm, please suggest, where to find it. I was searching some stores in internet, but, unfortunately, without any result((( I will visit Stockholm only for one day and it' s really important for me to find this item, because I am a fan of swedish military equipment. If I know correctly, in swedish this model, named "ryggsäck ST lätt, oanv" Also, who know some history of this backpack and interesting facts, write them for me. Thanks for everybody))