I have a bumper, but with carrying it in my left, front pants pocket, I'm really concerned that I am going to bang it on something while I'm at work. I tend to be a spaz...just a little. With my 3G it was no biggie....since it obviously didn't have a glass back.
I figured out a long time ago that cell phones belong in pockets rather than holsters and such...because I was alway wacking them on stuff. Since I switched to carrying in my pockets my phones have remained in really good shape.
Right now naked in an Oakley custom microfiber bag. Tuesday I'm getting full body ghost armor installed. Then depending on what cases are offered for free, we'll see from yhere