For a tiny pack, REI Outlet currently has a Pacsafe Venturesafe 150 Cross Body Pack - 2012 Closeout on sale for $27.73.

http://www.rei.com/product/856329/pacsafe-venturesafe-150-cross-body-pack-2012-closeout

I got one to try changing my EDC "system" from a waist pack, mainly because it is large enough to carry a 7-inch or 8-inch tablet computer. It holds an iPad Mini with protective case just fine, with a small amount of remaining room for extra gear. I'm pleased with its quality/construction.

Steve
_________________________
"After I had solaced my mind with the comfortable part of my condition, I
began to look round me, to see what kind of place I was in, and what was
next to be done"