I don't really know. Currently selling this for a friend and he can not remember the exact model. Here are some more pictures that may help with the questions that you may have. I hope this helps. Let me know if I can help you with some more info
Looks like a breakaway version of my Brooks pack - I believe they called it the saker. And they call it a 7400 cuin. I love my Brooks, super sized but makes an awesome day pack with just the wings used!