Nowadays, it is preety unusual to find someone who has a collection of CDs and DVDs with him/her while travelling. As the storage media we use get smaller and smaller, we turn to these more portable storage materials for the ease of travel.
Back in the day when flash drives are too expensive, however, a lot of people would still bring a handful of CDs with them. I should know, I was one of those people carrying CD binders complete with extra CD binder pages. with them. I would always bring around a dozen blank CDs then. This does not include the CDs that actually had data inside, too.
The only issue I had was that not every computer in town had a CD writer. Despite the cheap amount that one has to add in order to upgrade an ordinary reader to a writer, a lot of people and computer shops chose to not buy CD writers, which made the CD an unappealing storage material. I had to bring a floppy disk--and that was just less than a decade ago!
Well, it's a good thing that flash drives suddenly went down in value with other plug-and-play devices. Without them, I do not know how will I be surviving this period when I have to transfer massive amounts of data every single day--or maybe it's the other way around. Flash drives prompted people to transfer massive amounts of data.
I dunno. I'm just happy with my flash drives. I still keep the CDs for emergency situations, though.