Binders
A binder is chosen by capacity and by how much its contents move. Ring size sets how many pages fit; spine width sets whether it stands on a shelf without bowing. Undersizing is the usual mistake — a binder packed to its rated capacity will not close cleanly and pages tear out at the punch holes, so allow room to grow. Lever arch suits high-volume filing, insert binders suit anything needing a printed spine, and punchless saves you punching at all.
