I read this same question last month, from "bosab" - but it was in regards to a Tandem Island's sail bag. The question about the sail bag was included within a long post and was never really addressed on its own, or answered (that I can recall).
Quote:
Bobsab's post from 09/28/10: Subject: Tandem Island...Shape of Amas
"Only other issue with this otherwise great boat is the sail bag. The demo boats had real nice marine cloth sail bag, this model has a nicely sewn polytarp bag. It is functional but way less impressive than the cloth bag. Maybe a supply issue?"