« on: November 20, 2014, 11:31:25 AM »
No single good answer. Depends on what you want to carry, what's on your back, and how much "protection" you want to provide. I have been using a TT holster on my chest with my 5Diii and a lense in that holster. I keep the camera strap loose around my neck for "insurance" but the camera and lens is totally supported by the holster with the top zipped about 3/4 closed. This lets me bring out the camera quickly for a shot. If the weather gets ugly, I can drop the neck strap into the holster and close it completely and even put the TT rain over over it.
I used to attach the holster to the backpack straps using straps from Optecha. But, this required dealing with the camera when stopping or taking my pack off. On my last trek, I used the TT harness to hold the holster so the holster remained on my chest when removing the pack and was independent of the pack.
Pros: complete freedom to use trekking poles, good protection from dust/rain/falls, able to use both hands for climbing or scampering over boulders, camera quickly accessible.
Cons: can be hard to see my feet on steep downhills unless I nudge the holster to the side, need to bring an alternate way to carry when not on trail (I keep a shoulder/neck strap in my backpack that clips onto the holster for walking around town or campsites), in hot weather the combo can be uncomfortable cause both the backpack and front holster together are not conducive to ventilation/cooling.