ORIGINAL: mudgel
Hasn't everyone been on the "Don't use bundle files" bandwagon due to their unreliability and all eggs in 1 basket type of thinking.
Not me. For portability and backward compatibility with older versions of Sonar, bundles work fine. For archiving and backup: not a good thing because of the eggs in one basket reason. As far as corruptability, they're no more prone to corruption than any other file type, including CWP, but if you lose the bundle you lose all your audio too.
Of course you could compact the cwp and per-project audio into one neat file with WinRar and you'd end up with a smaller file.