thinking of getting Nex7 or Olympus EM-5

reason is travelling with a 7D overseas and into the wilderness is really tiring.... its heavy and when go in to jungle or hiking also affraid i damage it becoz it is so big.

This 2 seems nice but i cant decide.
EM-5 lens small and got weather seal.
Nex-7 very nice build camera but those lens are all giant size (which is like my canon)