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I use the Think Tank Retrospective 5 as my main bag, which is small for a shoulder bag, but not super tiny. It holds a lot of gear, though, and is way smaller than what I used to carry. It can hold a body + 4-5 lenses and a flash pretty easily.
When I want to travel light, I use the Lowepro Rezo 110, which can fit my OM-D with Oly 12/2 and 45/1.8 and the PL 25/1.4. It's very small.
When I want to travel SUPER light, I use a little Tenba belt pack that will fit my GX1 with the 12/2 or 45/1.8, and it has a little pouch on the outside that can barely fit the other of those two that isn't mounted.