Abstract: A quick-release capture mechanism for loose-leaf binders. Generally, the capture mechanism comprises binder posts and a retention clip that selectively and releasably attaches to a free end of the posts. The posts often comprise a tubular section and a post head with a recess defined between the two. In some cases, the retention clip is a rail having a plurality of elongated apertures that are configured to slidably and releasably engage with a plurality of posts, simultaneously. The apertures can have any suitable characteristic. For instance, the apertures can comprise a first width, a second width, and means for retaining a binder post within either the first or the second width. In such instances, while the first width is sized to allow the post head to be inserted perpendicularly therein, the second width is sized to receive the post's recess while preventing the head from passing perpendicularly therethrough.