Independent Reading Book Bins

A lot of teachers {including myself} use book bin carts at my school for students to house their "just right" books for independent reading time. Here is what my cart looks like...

I LOVE this thing and don't know how I survived without it. My books are no longer getting bashed, battered and brambled in desks AND it limits my kiddos to how many books they can have at a time - sorry 2nd grader book hoarders.
The numbers I put on them are a FREEBIE I posted on my Tpt store, so here you go!
http://www.teacherspayteachers.com/Product/Round-Black-and-White-Number-Labels-813351