I have an Olympus OM-D mirrorless setup. I see no need for a camera specific backpack to cycle with. I have a soft neoprene cover for my camera body with a lens on it, and then pouches for my other lenses.

This allows you to now use any messenger bag or any decent sized cycling specific backpack for your camera gear. This would be tougher with large DLSR gear, but because we are mirrorless users it's the best way. Now you have a bag that serves multiple purposes vs just a camera specific bag. My TimBuk2 works on rides, grocery runs, and just general messenger bag carry - with or without camera gear. And since it's designed for bike riding, it just makes more sense really. And since it's a messenger, it's easy to stop and access the bag's contents without taking off a backpack. Making it easier than a backpack to stop, grab your camera, and take a quick shot.

My camera pouch is this one, by OpTech: https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1

Medium lens pouch: https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1

I also use a large pouch for one lens.

My TimBukTwo large messenger bag or Osprey Cycling Backpack both work well as camera luggers now.

I used to have multiple pieces of think tank gear for years. Love their stuff. I used to get a lot of their stuff when I worked for a photography workshop, for free. I sold all of it a little bit after switching to mirrorless. I know they make mirrorless-specific packs now but never saw a need.

Now the only camera specific bags I have are 1 medium and 1 small Tenba shoulder bag. I never use them anymore though ever since I started using those pouches. I shoot multiple days a week as a pro real estate photographer and used the Tenba's all the time. Now I just use my TimBuk2 on every gig. In the summer I ride my bike to many gigs as well.