I've handled 35 mm and medium format cameras for years. Soon after buying my Canon 5Dsr last year, I was in a restaurant photographing the chef and some of his staf holding fresh, large and heavy whole fish. After staging the shot, now PICTURE THIS: The camera with flash is sitting on the counter to my right, facing me... I reached down and picked up the camera grasping the lens next to the camera body. I raised it off the counter, turning it around to grasp the left side of the camera body... and the lens RELEASED from the camera and fell to the concrete floor bending the focus and zoom rings and denting the mounting ring! And of course... trying to grab the separating lens, I inevitably dropped the body too!!! Folks... I've "responsibly" handled all kinds of professional cameras for over 50 years... and NEVER has something like this happened to me! And NO... I'm NOT getting old and feeble, thank you! My point here, and I've made it WELL KNOWN to Canon, is that the release button to the left of the lens mount should have a raised, protective ring, higher than the height of the button, effective to where you have to insert your finger tip to compress the button! But! This has probably never happened to anyone before and I don't see Canon giving "my" critical annalysis any credence. Yes... I'm VERY aware of extra care required to prevent such acts of foolishness. I've even hung outside of aircraft taking photos and videos of planes manuvering in and out of formation. I'm still here. My hope is that whoever reads this will now NOT be the SECOND ONE to do this! "Just sayin"...

I keep hearing about how everyone thinks their cameras are getting heavier or they think they need to pack lighter because they are getting older.
I am sorry to say these and I know I will be blasted for the following statement but....
Your gear is not getting heavier you are getting way out of shape. You need to get into an exercise program if you feel that 5 to 15 pounds of camera and flash are heavy.
My case is a foam lined metal case weighing in around 50 pounds. I carry it to my truck and on the job site. I usually carry two cameras (D7200) with attached lenses to a sporting event while putting an extra lens or two in my vest pockets. I am 67 years old and find that to be able to walk well and carry that gear I need to exercise. I chose weight lifting but then again I always choose weight lifting.
If you feel that your camera is weighing you down I suggest instead of a lighter load just get back into shape. Your wife and doctor would appreciate it and you will too.
For those of you who feel getting a mirror less camera will lighten the load.... face the fact you just want to have the new tech stuff and that mirror less is just the latest craze you want to be a part of.
Let's all face it men and women out there as we grow older we start to loose muscle mass around the age of 50. From there it is all down hill unless we start exercising regularly and add some muscle mass exercise to the routine.