I easily open boxes with a key. And carrying keys is essential. Personally, I can't stand to have a lot of nonessential stuff in my pockets. I don't even carry a wallet anymore. Haven't for maybe twenty years. Why should I? Everything is done with cards these days. Wallets are just good for collecting useless detritus. This is all I need for ID and transactions. It goes in a front pants pocket, not poking me in the butt every time I sit down.
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And no, I don't carry hankies either. Kleenex at home and in the car can handle any booger issues. Keys, card holder, and phone are all I need to have in my pockets. Oh ... I do often have a small comb in my back pants pocket but it is becoming less essential every day. Sigh!
I see way too many guys who wear Leatherman on their belts just to project a tough guy image that they are somehow mechanically inclined. Two of them I can think of right now can't figure out how to change oil in their cars. I can overhaul a car engine but don't see the need to advertise it.