As there are almost no caches hidden at TMB i decided to hide one at the nearly highest point of the TMB at Col De Fours - about 2664m above sealevel. The highest point of the TMB @2733m is only a few meters to go.
Weight was very important to me, so i could not place a "real" tupperbox sized cache, because that would have been to heavy and i had to leave my tent at home, which was a not acceptable option ;)
So try to find it, make your log into the logbook (a pen and some swiss france are in the box) and enter the hall of fame!
Have a lot of fun!