>>3615864You might consider getting something external like a "molle" attachment pack. I don't know how large your camera + lens will be, but this may give you ideas at least:
https://www.amazon.com/Savior-Equipment-Horizontal-Multi-Purpose-Attachment/dp/B07V1PXPX6/You could always chuck it into a pack and orient the zipper towards the exit. Most camera bags with zippers don't have the don't only on one side, they seem to unzip on 3 sides, which is a damn pain sometimes.