If you can't call them, email them. The Photoflex guys are extremely helpful. They have been happy to give me very specific specs on things several times.
I remember specifically once when I needed some inside measurements on one of their Transpac bags, the guy was very accommodating, actually went and took a specific measurement for me. AND, he added, "If I were you and you can wait, I'd wait a couple of months before buying this bag. It's being redesigned right now with much more heavy-duty zippers and handles that will be a big improvement." And he was right.
Shoot them an email.
Fantastic Plastic Entertainment, Inc. fantasticplastic.com