Just a word of caution...you might not be so lucky next time. The shelf life of a CD varies dramatically depending upon ambient temperature, humidity, and the manufacturing process. Writable CDs have shorter lives than commercially-available CD-ROMs because the writing process is very different.
Although people have reported problems with bundles, I have yet to hear of a case where someone saved a bundle file, opened it immediately thereafter to check for data integrity, and not have it open or be corrupted. Long-term, even the cells in flash RAM are subject to deterioration. If a bundle opened after saving but doesn't open years later, the problem is not with the bundle format.
The main problem with a bundle file is the same problem as a zip file - if just one bit is missing, the whole thing will likely be trashed. Saving a project file and its associated audio means that even if there is media corruption you probably won't lose the whole thing.
Remember the old adage..."Digital data isn't real unless it exists in at least two places."
FYI, of all the optical media options, Blu-Ray is considered the most robust according to several studies regarding media longevity.