I am a Sony a7 III user and had used two lenses in the past. The Sony 24mm f1.4 and the Sony 70-200mm f4. I really enjoyed shooting with both lenses but realized that I would like to get more out of my camera or to expand my creativity.
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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 on it.