I just got my new favorite cheap accessory in the mail today.
Going on a 2 week trip in 17 days, and I have (because of a sale) a bunch of cards. Okay, 11. I have 6xSandisk Ultra 4GB, 1xUltra 8GB, 1x old Ultra II 4GB (second string), 1x Ultra II 2GB (third string), 1x Patriot slow 4GB ("oh s#!* time to start shooting JPG"), and a 4GB Micro with adapter from my phone (only use in case of war).
Packing them all in the little plastic cases was overflowing all the little elastic places I had in my Lowepro Slingshot 100, so I got one of these for $7.75 shipped:
I wouldn't feel comfortable packing it full to capacity, but with my cards in it, it still has a good cushion and the zipper still zips.
It's small enough to easily pocket, and it's fully independent of my camera bag now.
Sure the zipper will break at some point, and the plastic pages are soft enough to easily tear, but if it makes it through my trip (I'm confident it will), it'll be worth it.