/ Camera bag
Holster case (Lowepro/ThinkTank) either over the shoulder or in a normal pack works for me
This is the largest pack they make, plenty of other options.
I too can reccomend ClikElite bags very highly. They're a bit tricky to get in the UK but I think amazon now sell them. their chest carrier sounds like just the sort of thing you want. You can put it on as a bag on it's own or take all of the straps off and put it inside a larger bag.
hope that helps
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