I have every one of my sets (1954 - today in 3-inch binders standing vertically. I only have one set that seems included to bend (1963 for some reason.)
The real problem I had was with the smaller sets (i.e. 1954-1956) where there aren't enough pages worth of cards to fill up an entire 3" binder. I didn't want to use 2" because of aesthetics. What I did was create a sort of "pillow" that was the same size as the sheets and that hooks into the three rings and fills the space behind the set. Usually a 3/4 inch filler works. That keeps the cards from slouching in the binders.
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