Ok, got word from Cool4u2view, a good guy with Neuros, and heres the scoop.
The paragraph hes mentioning reads:
"Please note that this Bundle provides the Neuros 128mb player and small backpack with a 20GB hard drive backpack. HD units not sold as bundles do not have this functionality as the flash memory on those players do not have as much capacity and the small backpack is not sold separately)"
This means, that when you buy a bundle you are getting the main player, a Hard Drive backpack (20-80 gig) and a batter backpack (the small thing). The actual player itself holds 256mb of music, but has no battery, so its saying you cannot turn on the flash player without a battery backpack, which can only be bought in a bundle, but there are other ways to get them. I presonally do not have a battery backpack, but i think it would be a good idea to find one, cause it makes it a lot smaller of an object to carrd around, and that 256 could hold maybe two Essential mixes lol. I hope that answers your question