Man bags are pretty much a necessity for working in the office - can't say I use mine too much out side of that.
I almost always have a shoulder bag - one for the office and one for the weekend.
The office one will take the usual keys, wallet & phone along with pencils, pens, umbrella, bottled water etc. The weekend one takes everything including nappies, baby wipes and snacks for the young 'un.
If I'm going out for the night, I'll only take the bare necessities - hall door key, plastic and my phone. The phone's an old Nokia which is very compact & fits into a top pocket.
Ha. I am a massive fan of rocking the old Nokias. I have an 8800, and it's just about the best thing in the whole world.
And of course, you can't beat an old Nokia for battery life - 3 to 4 days without a recharge, sometimes a week. :)
I actually find that newer smartphones aren't as good at maintaining calls either. For me it's mainly to do with the build quality. I drop, lob, lose, forget my phone, so something cheap, easily replaceable, and nigh on indestructible is pretty much perfect for me.
I've got over the not having a camera, as - well, there are quite enough drunken photos of me floating around the internet.
The smartphone unfortunately has been firmly cemented in the 'Need' accessory for me. I'm not constantly tweeting, instagramming, fb etc.. but I hate not being able to access email and a camera if needed.
Plus its two fingers to the networks who made out they were doing you a favour by increasing your mins and rip-off texts back in the day. Keep 'em. Just give me the wifi and a bit of data.
I'm attempting to try to not get to that place. I have just started twattering though.
I'm a stickler for 'proper' photography also, so unless smartphones start rocking D-SLRs, I'm safe.
Should that day come however, I'm just about as fucked as the fall of my suit jacket's gonna be when it's got an 18-135mm lens in the breast pocket.