The sling for sure is awesome. Didn't know they had two sizes. I got the original one from the Kickstarter and it's been perfect for a camera with 2 lenses or camera, a lense, and some snacks lol I can get a can in there and keep it separated from my camera using the divider but a water bottle would not work inside the bag with the camera. You'd need another plan for that...maybe one of those light shoulder can/water bottle carriers? as for the new Sony...enjoy breaking her in ❣️