Congratulations unless corrected you have either a Bavarian Rucksacktornister or Prussian Ersatztornister model 1914 see book one pge.333 German version of Kraus.
Wonderful I love it,
many thanks dude do you have photo from this book could you ad this photo here?
Its just a diagram, btw those two Kraus volumes are indispensable the best ref. books I've ever purchased I could translate the text I guess but yours is a dead ringer.