A Micro 4/3s body like an Olympus EP5, EPL5, or new EPL7 will give you really nice IQ along with light weight. Add a Metabones speed booster or smart adapter and you can use your Canon EF lenses too and have the oly set the aperture automatically. Since I picked up an Oly M43 I seldom use my 5DIII or 1D4 for travel anymore. I started with an EM-5, then got the most excellent EM-1 (both weathersealed), but am getting rid of the EM5 for an EP5 just so I can use the Metabones and Canon lens combination. I use a two piece neoprene booty over the camera/lens to carry it. The top part clips off leaving the bottom still attached protecting the camera from bump, the original camera strap still is used to carry it.