Here's what's in my shoulder bag. The picture doesn't include the Sony DCS-M1 I took the picture with or my Nokia 9300 which was in my pocket...
Other missing things that are usually in my bag are my power supply for my PowerBook, if I am flying United a special power supply for United seats.
Also, missing are various power adapters that are being used in the room right now.
On flights, this bag will include a book and a few PSP games.
The reason I am carrying both Etymotic Research ER-6s and Sesaphonics is because the Sensaphonics are nearly invisible and also difficult to extract. I use the ER-6s when there is a likelihood of being interrupted or where having people know I am listening to something is desireable.