Well, I kind of think right now that I will go with the 24-105, 24TS and 100-400. Overpacking is my constant mistake as well. Last year I dragged around so many filters and accessories and hardly used them....
The TS-E would be kind of redundand with the 24-105, but since it is an incredibly sharp lens and kind of my most recent "toy" I will bring it with me. Don´t know if I will drag it along with me on all hikes, yet.
The 50mm ist nice, but I am not sure if I am going to do much indoor and low light shooting. And even if so, I still can bump up the ISO and still get away with some decent pictures using the 24-105, considered the 5D2's performance in high ISO shooting. Kind of regret selling the 24-70 f2,8 sometimes...
Well I still have a couple of weeks to contemplate.
Thanks for the kind advice so far!
My personal preference would be to carry two camera and bring the 17-40 and the 70-200, and toss the 50 and a couple of Holgas in the bag. I also like my 24/TS but rarely bring it on vacation.