Osprey Escapist 15 (litre) bike backpack. I have had this a while and used it lots so it is worn, but doesn't show many signs of this after examining just now. It's a great bike pack, but with wanting to carry a camera + lens + a few layers and tripod it isn't quite big enough. I've bought another just bigger. It's fine for snacks, repair kit, 1st aid and a couple of layers. Colour - Black. Size med/Large.
Probably easier to google the many features, but in brief it has a main section, separate section for water bladder (not included), tool organiser pocket, bright yellow rain cover, sunglass/small item pocket on the top and helmet carry facility.
Any questions please ask. And for pictures (I'll try and get them online and post a link) . thanks.