Tumi crossbody bag that I bought at an outlet for $110. I use it for carrying headphones, phone charger, advil, lotion, snacks, money, etc. mostly when playing live poker.
number of pockets, durability, and trackability (you can register it at the Tumi website) were the sellers for me.
and I'm just gonna throw this in the thread even though it doesn't come out till next month because it's going to be good:
The Food Lab, book by Kenji from seriouseats.com for home cooks.