I bought a few nylon zippered makeup pouches from Target... for $1. They are apparently indestructible - they're about 6-years-old and show zero wear (jinx in 3... 2... ). The cool part - they are the exact dimension of a jersey pocket.
I don't like the seat bags for the aesthetics. But, more than that, they're clumsy - when you need the tools/tubes, etc. They unzip and dump like a dumptruck. Having a separate pouch and/or loose stuff in the pocket makes the road-side repairs a bit easier. Oh sure - first world problems and all that.