To avoid the sagging of binder pages, I think the key is preventing the binder front and back covers from splaying out by keeping them close to the front and back pages. If a binder is pretty much full, you can do this by sliding it upright between large books or other binders that are similarly full. If a binder isn't full, and the rigid front and back covers aren't close to parallel, then it's tougher to accomplish. Another way to address this problem is to purchase slip covers that binders slide into.
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