Opens with the press of the lever. Only need one hand (a thumb) to open no more tugging. If you try to open it by tugging on the rings it won't open. (Press the lever.) No worries about the binder popping open. Very high quality and well made. I'm addicted and made the switch to the "Staples Better Binder".
These binders are great! My son has used one every year through Middle School and High School and they survive the rough treatment for the whole school year! Our Staples Store offers a recycle program where you can turn in your old binder for a monetary credit towards a new binder so each year he picks out a different cool color. ( Plus it would be boring to have the same color over and over again.) There is plenty of room inside for all of his school supplies. He carries paper pens and pencils using a three-ring pencil case calculator graph paper and double-sided three-ring pocket folders (also from Staples) neatly inside. Everything is organized and easy to reach! : )