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Initially, I was playing with the thought to get the 70-200mm f2.8 but realized that I take most of my pictures outside and that there are more creative opportunities for me if I would get the Sony 100-400mm* instead.
A new lens like the Sony 100-400mm also required me to buy a new camera bag that should have a small footprint as well in order to be able to take it to more extended trips or into my packraft.
The second option would have been the Think Tank Photo Digital Holster 30 V2.0.
However, I decided to go with the Lowepro Toploader Pro 75 AW II* as I read somewhere that it might be difficult to get the Sony 100-400mm lens in and out. Moreover, there was not a dedicated system to attach another lens case to it.
You can find a list of my camera gear here.