Samsill has a combination binder that I think many of you will find interesting. They're called the Duo 2-in-1 Organizer and the Trio 3-in-1 Organizer. It is a combination of a ring binder and an expanding file pocket and, in the case of the Trio, a hanging file folder all in one.
The Duo comes in 6 fashion colors - black, burgundy, turquoise, hot pink, orchid and green. See all the colors here.
The Trio comes in black and turquoise, as shown below. Both the Duo and the Trio come with dual elastic closures so you can get into each part individually. The binder section is a 1 inch ring binder that holds up to 225 sheets and the expanding file section has 7 accordion pockets with write-on index tabs. The Trio has retractable hangers so it can become a hanging file folder as well. Both styles are made out of polypropylene, so they're durable and water resistant.
This item seems like it would be a great tool for salespeople - you can carry proposals, sell sheets, contracts, usage reports, etc and have a separate place for everything. It would also be good for students to organize homework assignments or for organizing medical records, tax records, bills, etc.
I haven't had the opportunity to try this out in person - perhaps if our good friends at Samsill are reading this they'll send me a sample!