I've always used "D-ring" 3-ring binders for anything where I don't want the papers to get damaged in storage. The rings aren't on the middle spine of the binder, they're tucked over to the side so the pages don't have to move whenever you open the binder. The rings aren't round, so the papers stack up in a straighter line as well.
They're common in Canada, easy to find in the stationary / office equipment stores.
Ryan
