I was so tired of binders that rip at the spine even though they are made of vinyl. This binder is the sturdiest easiest to open that I have ever bought. I am planning on replacing all my old binders with these.
I have numerous topic requirements and I found this binder to be excellent. It doesn't slip and slide stays open and flat when in use very easy to open. Excellent product.
As a stamp collector I use these binders to hold extra stock and collectable envelopes. It seems to be the most durable of any binder I've been able to find and currently I have around 20 or so binders.