Good, portable headphones are hard to come by.
Most of the great headphones out there aren't all that portable. Even with collapsible sides, many still take up quite a bit of space in your bag. That makes bringing decent headphones with you when you also plan on bringing your VR headset with you filling even more space when you go around every day. You could go earbuds, or you could take a look at some smarter headphones.
After spending a couple of weeks with the Fiil Diva headphones, it's clear these are the headphones VR fans should be looking at for their next audio fix.