Commercially available triple layer Blu-ray discs can come in 100GB (rewritable) or even 128GB (write once) variants. This standard is known as "BDXL" if you want to look it up. For archival purposes there have been many different optical disc technologies available, though often not directly to consumers. Sony has its own 12cm Archival Disc standard that will reach 300GB capacity this year according to their roadmap, with a 500GB and 1TB variant coming later. Then there's HVD (Holographic Versatile Disc) that has been in development for close to a decade now and can theoretically reach >5TB on a 12cm disc. I expect by the time HVD becomes commercially viable that the market has already responded in favor of digital distribution, so like Archival Disc, HVD will mostly be used for data archival.