Karl Lagerfeld “Cara” black knapsack backpack

This seems to be somewhat rare style bag from this designer. I’ve looked all over and I have only been able to find the ones in use condition that sell for about $170. I have use this one precisely ones and if you look closely in the pictures you can even see that there is part of a tank left on it. I am a horrible photographer but would be happy to take more photos and answer any questions. Open to reasonable offers, I am a motivated seller