Just for giggles, here's a pic of the gear that I took with me on a 4 week family vacation to England and France (from Canada) this past summer:
Here's one of the pics I took with the 6x7 camera. It will make a great 16x20 if I choose to do that.
Now, I was not backpacking. I always had a home base (hotel, apartment, car) to leave gear that I did not feel like carrying on any day. Having said that, I actually did carry around all this gear on almost every day. (It was a big commitment but I'm very committed to photography.)