C3PX said:
It may be a space saving feature, but why do you need to save space when the case is still the same size?

For standard movies that come in regular sized cases, no it doesn't save space. But there are a lot more TV series coming out on DVD now than a few years ago when double sided discs were in use more. A box of any given TV show season can be anywhere from 5 to 8 discs. Hell, the "Young Indy" box sets were 10 and 12 discs per box, and there's three of those. That's over 30 discs. Star Trek is 6 to 7 discs per season, and there's 28 seasons among the five series, plus 10 movies, each of them being a 2 disc set. That's well over 200 discs if you're a completist. Doing those as double sided adds up to a considerable space savings.