Depends on your definition of "travel case", I suppose. Sure, the Doepfer stuff has handles and so on, but you could go with a Mantis which can be had with a gig bag designed for that cab itself. But the bigger difference there is actually the cost: Doepfer A-100 6U = $530, Mantis = $335 + another $39 for the gig bag. There's definitely more space for utility and ancillary control modules with the additional 40 hp you'd get, too.
For example, if you wanted to go with the Time's Arrow (16 hp), that leaves 24 hp still open...and if you're adding a generative sequencer like that, you'll want some logic + other timing-altering widgets, quite a bit of that 24 hp would probably be best suited for those, and changes to what's already in the 2 x 84 version above would be minimal. But have a deeper look at the current case situation in Eurorack...some time back, I would've probably gone with the same 2 x 84 for a small travel rig, but just in the past five years, that whole aspect of the Eurorack thing got turned on its head by innovations such as the Mantis, Intellijel's 7U x 104 powered cabs, etc.