As it seems inappropriate to carry a bag full of glasses, that's exactly what I've been doing when I travel. Three four aviators, two wayfarers, one can't-live-without prescription glasses, you count it.
I'm gonna start with the awesomest thing.
When I knew that Warby Parker was launching their latest collection, Beacon, I believe this collection will be huge. The greatest comes from the unexpected, just like this collection is designed to get you through your day whatever the time, wherever you are. Even better, you can get your prescription for every design if you're like me, even sunglasses - I'd prefer that. It's been such a pain in the ass to not able to 'see' in my sunnies, without my prescription glasses. So, yay to us, four-eyes.
Another great thing about their latest range is that their glasses are so so fashionable. I believe that it's not easy to find affordable line of fashionable glasses; they're not always in the highest quality.
They also have the 'Home Try-On' which let you pick out 5 pairs of glasses and have them shipped the glasses to you to try for free! I am impressed.