Lastly, if you need to put 150 pounds of force on your phone, buy a different one. The ultra-thin 6 is not the phone for you.
I was trying to decide on whether to buy a 6 Plus or a 6. After spending a fair amount of time in the Apple store, where I put an Apple Leather Case on the Plus and dropped it in my pocket, I was still concerned about discomfort during day-to-day activities. And despite my earlier assertion that the 6 Plus had a bend rate of 0.00000285714286, I was still slightly concerned about the possibility of it bending.
So, I made myself a very delicate iPhone 6 out of cardboard. That's right, cardboard. I made it 4mm wider and taller to accommodate a typical case, and 2mm thicker (so it was BIGGER than the 6 Plus with no case). I then went around my typical daily tasks, with the 6 in the left front pocket of my Dockers shorts. See attached image.
I sat down multiple times on every chair type in the house (probably 60 times).
I laid on the bed.
I swung on the hammock.
I climbed a ladder.
I laid on the couch.
I sat on the couch hunched forward working on the laptop.
I sat on the floor and played with the kids (crawling around building Legos).
I tried kneeling.
I crossed my legs.
I rode the recumbent exercise bike (for only 5 minutes, but it was an effective test).
I sat in both our cars.
The kids played Daddy Jungle Gym.
After several hours, what happened to my super-delicate, massive cardboard iPhone 6? Not a darn thing. No bending, no wrinkled cardboard, no frayed corners, nothing. Throughout all these exercises the phone was never more than snug in my pocket. You can't even tell the cardboard was in my pocket much less for 3 hours through all those activities. My concerns about the iPhone 6 bending in my pocket are completely alleviated.
Other observations:
1) I did tend to notice the phone in my pocket more. With the case it's basically the same thickness as the 5s in an Apple Leather case.
2) Crossing my legs was the biggest challenge, but was doable. Re-positioning the phone down to the side of my leg worked perfectly fine.
3) The phone approaches the top of the pocket, so while biking I was concerned that it may fall out. The 6 Plus without a case might be slippery enough to do that, but it would never happen with a non-slippery case on.
Referring the Consumer Reports video... put 4 pencils in your pocket and try your hardest to break them. I bet you can't do it.
Yes, this image is of my "iPhone 6 Plus" after 3 hours in my pocket.