I was resorting my bike bag after my trip and thought that this hadn't been mentioned. A sock. you can put your small items in a sock to put in your back pocket.

I was actually told this trick at the bike shop when I bought my bike. To put your tube, and other tire changing gear into an old sock inside your bike bag, that way when you have a flat you just pull out your sock and have all you need.

I keep mine in a small wedge bag that I also keep my money and driver's license and bars, eye drops, money, cell phone

I don't like things in my back pockets either.

Oh, and a reminder, always take a card with your personal info on it in your pack or back pocket. You can put your business card in there. Also the business card of your SO. Make sure that the cell phone numbers are there.

Finally, you should program ICE into your cell phone. That stands for "in case of emergency" and input your emergency contact.