Recommend a bag for two cameras: X-E1 and GH2 at the same time

Since neither of them are very heavy you can use a shoulder bag because that (to me anyway) is still about the best blend of transport bag and working bag you can get as long as the load is not too heavy.

The Billingham Hadley Pro would work (and would take an iPad or Macbook Air too) or one of the smaller Think Tank Retrospectives.

Certainly I would avoid the ubiquitous backpacks which litter the second hand listings because people are swayed by the marketers before realising that a camera securely stored on your back is as available for a quick shot as a camera you left behind at home...!

Great if you actually ARE trekking with your gear of course, but really no help otherwise IMV.