Help with 16x20 Photo Portfolio Book

I'm looking to purchase a book/album with sleeves/pages that will hold quite a few 16x20 prints. I wanted to hear recommendations before I go out and purchase anything. The sleeve pages need to be acid free and print friendly. Thanks in advance for your recommendations.

I should also probably clarify that I would like the pages to be able to flip. I'm not just looking for a 16x20 case for transport.

I'd like this info as well.

Scott
I use the Itoya folios.

Thanks Steve. That's exactly what I was looking for. I believe they are called the "Itoya The Original Art Profolio 16x20in" in case anyone is searching. The best price that I found was on Amazon.

Scott, Try Meininger or at least I think thats what is called on Broadway just south of 5th Ave.

Scott
I use the Itoya folios too. I've had my current ones for a couple years and they hold up very well. One thing though, the picture is a little dull inside the sleeve so if I have a customer who is interested, I pull it from the sleeve so they can see the full impact.

+1 for Itoya (Steve Weaver is my consultant.)

In case anyone wants a larger portfolio I picked up a 18x24 here. Amazon does not have this size. The item price is great, however they get you with shipping. All in all, a fair price of $38.00.
https://www.carpediemstore.com/mlistCategoriesAndProducts.asp?midCategory=175

I use a 17" folio by Artware by Robert Ware designs. I picked it up at Aaron Brothers and they have additional page inserts. It's flip style and can handle two prints per page if desired.