My Tom Bihn Ego bag is normally used for my weekend tech load.
But this week I used it for a two night trip to our national capital, along with my MCB. We travelled by train 4.5 hrs each way. We stayed in a nice hotel so I took only the minimum in toiletries, which saved a little weight.
The ego weighed about 5.8 kg, the cafe bag hardly anything :-). My stuff fitted in comfortably and there were even a couple things I didn't use (ie could have reasonably left behind)
(click through to flickr for labels on pictures)