Not sure of the sizes you have, but if your anything like me...
Here's the small A5 size, great for little stuff.. these store in a drawer, and come out whenever.
The next, and most popular size is A4, for those 10x8's, and a little bigger..
These just sit on a shelf..
And A3 size, also sit on a shelf, this is the folder type.. same as the A5.
And this A3 is the same as the lever arch type...