I did a lot of research into options and decided to use the Cotton Carrier Strapshot that attaches/ties in to your pack and wraps around the strap of your pack itself - it also has a security tether that further attaches to the camera to prevent accidental drops in case you don't quite secure the camera in the holster on your strap. Super-easy to use - just attach a small metal piece to the bottom of your camera where the tripod would usually attach, that piece fits into a slot in the holster on your pack strap and is unlocked or locked by simply twisting the camera about 90 degrees, great for taking photos on the go!
For standard day trips this usually works out fine but the ideal system (if you're using the Strapshot) would be to have two of them, with one on each strap, so you could alter which shoulder was bearing the extra weight over the course of the day. Now, that might not be necessary for you, but I carry a big DSLR and the lenses aren't light lenses either, so having that on your shoulder for those long days and big gains starts to weigh on you in a literal way.
For the coming season as I pursue big peaks again I'll buy a second Strapshot so I can move the camera from one strap to the other. This is awesome for me because I can get my DSLR from completely secure (I've used this to keep my camera while ascending challenging scrambling routes on lots of class 3 scrambling with exposure and even a fair amount in the class 4 range of difficulty with significant exposure without any worry about the security of the camera itself). Occasionally I'll take the camera off the Strapshot and put it in my pack for particular areas of going through high water in canyons, etc., but it's an extremely capable thing and has allowed me to use my DSLR as often as I used to use my point and shoot camera if I'm so inclined.
A couple of use notes for outdoor/landscape stuff: This is a great unit to keep your DSLR immediately accessible while you're hiking with a pack, and it's good on just about any kind of terrain you'd normally be dealing with. Again, for those rarer times you might not want your camera strapped to the front of you - like glacier/steep snow and ice ascents or fording significant streams/water crossings in canyons, etc. it's very easy to detach the camera from the hostler and stash it in your main pack or dry bag or whatever you've got to keep it more safe, and then to put it back on later. The biggest logistical challenge I've found to using this is if you're planning on doing serious landscape photography with a tripod you have to remove the Strapshot attachment in order to attach the tripod; that takes a minute or two of your time, but that is the biggest challenge I've found to using this. For me, most of my day is spent hiking and taking handheld shots, so having my camera immediately accessible where I just pop it out of the holster and it's already up almost in shooting position even while in the holster where I just need to take off the lens cap and shoot works great for me. My favorite thing about this unit is that I can keep my DSLR set-up out and that accessible on the vast majority of (often) complex terrain I deal with.
https://www.bhphotovideo.com/c/prod...ier_233_ev1_strapshot_for_full_size_dslr.html
There's my Nikon D810 with large 16-35mm f/4 on class 3 terrain up high on Middle Teton from early September. I just detach the Strapshot units from my big backpack to my smaller daypack as needed for summiting peaks. Works great!