I am a local historican and have been using these binders for many years.I probably have 25 - 30 ofeten filled to over-flowing though like any good gardner when they get that big I consider it time to divide the material and start a new binder... So on the whole I love these binders but this one when I got it filled the rings did not want to close propoerly and the whole mechanism seemed like someone had decided to cut costs and put in lighter weight rings and closing/opening mechanism...