Originally posted by sabzijoon I never thought about using a sling. My issue is that I always like to travel light. So, I listed the maximum amount of gear I ever see myself carrying. Though, I think 90% of the time, I'd carry just carry a Pentax K-1 with an ultra-wide and the other K-1 with the 43mm and throw in the 100mm or a short telephoto like the 77mm for good measure.
I recently got a Thinktank Turnstyle sling for "Traveling light. The one I have (photo below) would not be big enough, the largest lens I had in there was a Sigma 17-50, but they make a
larger one. Watch the video on the site to see what it can hold, I think they have videos for most of their products. Anyway I really like it' it's very comfortable and compact. Yesterday I walked for about 2 1/2 hours with the bag holding a K-50 with Sigma 17-50 mounted, a DA 18-135, HD DA 15, and an F 50, while carrying a K-30 with a F 35-70 on a shoulder strap, no shoulder fatigue. It's very easy to slide it around , open it grab the other camera., or change a lens. The nice thing about the design is that you can get to everything without taking the bag off.