A binder, with a first panel and at least one fastener. The fastener has a base attached to the panel and a binding member positionable in a closed position defining a closed loop, and in an open position in which the loop is open for mounting and dismounting sheets thereto. A lock is disposed in close proximity with the base and in releasable locking association with the binding member in the closed position. A lever is operatively connected with the lock such that depressing the lever in an unlocking direction causes the lock to release the binding member from the closed position.