THE NORTH FACE Black Base Camp Voyager Black Messenger Bag. I bought this from new and have used it, it is in excellent external condition but the lining has cracked a little (please see photos).

The adjustable strap means you can wear it on your back, shoulder or down by your side. It's got a padded laptop pocket, an external zip pocket for easy access to your phone and wallet, and a fold-down main compartment to protect your belongings. The shoulder strap has a stabiliser strap that makes this bag comfortable to wear when you're riding a bike. Fill it with everything you need for the day's adventures.

Features:
* Shoulder strap has a stabiliser strap that makes the pack comfortable to wear when you’re riding a bike
* Adjustable shoulder strap allows you to carry the bag on your back, on either shoulder or at your side
* Central-compartment flap folds down to help protect items
* Padded 16" laptop pocket
* External, secure-zip pocket for quick-access items
* Padded top handle
* Bartacks allow you to clip things to the pack
* Reflective strips on front of bag 

RRP £99

I also have a second one of these bags in Khaki. 

Thanks for looking!