Finding a big bag for small mirrorless cameras is a challenge. Most mirrorless bags are built on the assumption that you only want to carry a body and a couple of lenses, and maybe an iPad. Most big bags are designed for dSLR gear, meaning the lens holes are way too big and way too deep to safely accommodate the small mirrorless gear. In this article I'll talk about the ThinkTank StreetWalker HardDrive, which is a great (big) bag that leans towards smaller for the mirrorless set, but isn't exactly right. However, ThinkThank just announced the new Perception line, which may well be the perfect new bag. I've attached the press release on that at the end of this piece.
The ThinkTank StreetWalker HardDrive Camera Backpack
The ThinkTank StreetWalker HardDrive can hold a lot of gear, but as you can see in the photo the GH4 and GX7 cameras are much more shallow than the bag itself. Most lenses have too much bounce room, and most of the lenses that reach the top are actually multiple lenses, stacked on top of each-other!