Halfway1,
If you find a good soft case for your halfway, please share with us. I am planning an international trip with my girfriend (and 2 halfways), and we do have the hard luggage needed for that. However, there are several short trips we have in mind (including some islands while overseas and Key West here in Florida) that a hard luggage is not viable but we must have the bike covered to be able to board the boats.
I am not really sure what to say except that there is a 2006 Dahon catalog (PDF file in German that the link doesn't work anymore but we all had a chance to see) with a nice, solid thick nylon bag for 20" that (so far) is the only thing I would consider.
The bag that comes with the Halfway is far from a convenience, I have to agree. On the other hand, I haven't seen anything much better out there. Maybe other members will get back to us about a decent carrying bag. So far, I still haven't found what I am looking for as a soft bag.
Rafael Guerra