I'm packing for my vacation, and the massive size and weight advantage of the mu43 kit is really hitting home right now - the packing list for the camera bag: - E-M5 - GF2 - 14/2.5, 20/1.7, 45/1.8 - 12-50, 7-14 - 3 batteries per camera - Lens pen This all goes into a padded liner from a crumpler shoulder bag slipped into a discrete, fully waterproof black backpack. Things that jump out at me: 1. TINY. At least half the liner is still empty, so plenty of space for day trips 2. LIGHT. The whole unit weights in at 2 kg. That's the same as my 5DII+24-105 would weigh with a spare battery in this bag. I could easily fit another couple of lenses (telephoto zoom, anyone?) in there and still have a very, very compact little package. And that's 1 extremely capable and 1 very capable little camera and a broad selection of glassware that can cover pretty much any lighting or weather conditions.