Not really expandable at all. I think that the difference between the versions (besides 2/4 wheels) is the expansion. Travelite Delite v1 was expandable; v2 was not. I've learned to deal with no expansion on the Travelite Delite, so it wasn't a deal breaker for me on this bag.

A lot about the bag (the wheels, the feeling when pulling, and the interior layout) are very similar to the Travelite Delite v2, but with a bit more structure it may not have the zipper issues I am seeing with the Travelite.

The Antler website has the best photos of the bag and there is not one showing any expansion, nor do I show any in my photos.

By the way, the Antler shop staff were entirely useless, just three ladies playing around the entire time and had zero knowledge of luggage.