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How about a smart watch instead?

I picked up a Samsung Gear S3 watch a few months ago when Amazon was having a sale ($110 plus tax). Mine is the bluetooth version. I can answer calls on it (surprisingly good audio), read email and texts, and get alerts from most of my other phone apps. Sending email/texts is tedious but can be done in a pinch. I can also initiate calls from the watch as well. I'm still experimenting with it, but, I like it a lot more than I expected.

In the OP's case, he can put the phone in the sling bag and do much of his comms via the watch.

I hate stuff in my pockets, too.