Very pleased with purchase of ThinkTank CityWalker 20 from SpeedGraphic. I purchased the bag after reading many reviews on the internet (I found the ThinkTank YouTube videos particularly useful) in deciding which one to purchase ahead of my recent trip to India. I wanted to take out my Canon 5D Mk iii with 16-35 f2.8 Mk ii, 24-70 f2.8 Mk ii and 70-200 f2.8 Mk ii. These all fitted into the bag very well, together with 580 Ex Mk ii and circular polarisers. My iPad mini fitted into the padded pocket and the expanding pockets accommodated two water bottles. Interior pockets provided ample storage for spare batteries and the internal zippered pocket provided a secure locating for passport, etc. This made the bag quite heavy (inevitable with this amount of equipment) but the padded section attached to the strap made it comfortable to carry even in the heat (38 degrees Celsius). The bag - minus the water bottles! - fitted into my cabin baggage making it easy to transport around the airport while awaiting flights. The bag is also smart! I had thought of taking my Billingham 307 but that is heavier and has a lot of straps. The ThinkTank YouTube video also gives an example kit for fitting into a CityWalker 10 (5D with 24 TSE, 50 and 100 L Macro and I am seriously considering purchasing this smaller bag for when I want to travel lighter.