Meg-

Bike Fridays fold up - they fit in an airline checkable suitcase. You can fly with them (generally) for no excess baggage charges. They also readily fit in car trunks and the like.

They may not look comfortable, but they actually are. My DH did a century last year on his, and he looks forward to many more on it this year. He finds it more comfortable than his big wheel. Ours are configured like road bikes, with drop bars - they really are more comfortable than they look!