if 1gb is all you're after, there are a couple different usb memory drives that are offered in that size. they won't be very cheap, though. i'll see if i can find a couple.
the bad thing about jumpy's idea is that you would have a large, heavier thing to transport, as well as a power adapter to plug in. if you find a memory drive, it will be the size of a large key, way more durable, and won't need any extra equipment. but, again, more expensive.
depends which way you wanna go.