I'd like to be able to conveniently haul my E-M1, a couple of 72mm filters, a set of extension tubes, some batteries, 300mm Pro + 1.4 TC, 40-150mm Pro, 12-40mm Pro and 7.5mm FE. I know it's a pile of glass, but don't think I would haul anything more with all those lenses. I might take the 300mm out and substitute the 60mm macro and a flash on occasion. I used to have a LowePro backpack in the manual focus film camera days that had a padded bottom pocket for my 400mm. It opened on one end and kept the lens separate from all the other gear. Anyone have recommendations for this heap of stuff?