We have Velo Safe 2. It's a tough fit for two bikes but one goes in so easily.

It's been to Hawaii, Australia and Maine twice. It's got wheels and a strap so getting through the airport really isn't too difficult. It's sturdy enough that you can stack other luggage on top of it.

It is big though and you want to rent a car large enough to get it into. When we travel with it we tend to get a minivan. It was tight fit into my sister's Explorer with additional luggage for two.

Veronica