You can also get that stuff you put on wire and heat it to shrink. Downside is needing to cut it off to reinsert new pages, otherwise it works well. Big problem I see with binders is people use too small or too big for the amount of pages and the binders start to stuff out from too many pages or get bent up from not enough pages.. An O ring binder is going to hold about 1/3rd less than a D ring binder as well. I've tried every kind, none are made to withstand nightly use. The last ones i've tried have actually been in use almost a year. Only replaced 4 out of 12.
http://www.staples.com/1-1-2-inch-Ca...product_614325
This year I actually have to upgrade to a 2" binder.
I also have my books available for phone apps & online so those that bring in laptops or tablets can view at anytime which is helping to reduce the need for books - would like to add a kiosk station as well, then books won't be as necessary as once was, although there are always those who like to sit & look at a book (i'm one) so I will always offer those too - just won't need as many. Also looking into cheap tablets that can do not much more than be an e-reader that I can offer instead of books entirely.