I put a Sony Walkman with 14 GB capability in my left bag velcro'd to the back wall and have 55 CD's recorded on it and they only used up a little over 2GB so I could possible record over 300 albums on it and still have room for more. On an all day ride I don't get thru 1/4 of those Cd's and also one nice aspect is the fact that the Sony has a little power coming out of it more so than a thumb drive which has none. The amplifier in the bike takes that little bit of power and amplifies the music to the speakers, its definitely a good volume coming out of the speaker system as at freeway speeds I am only running the system at 13 or 14 on the volume with no distortion and nice crystal clear music. Oh and the Sony comes with a USB cable ready to plug into the port in the left bag. But then again you won't get the Sony for $14.99 but I still think its worth the extra cash.