Hello Creative Teachers! I am going to have my 5/6 class keep their subject duotangs in a container on the bookshelf where the text books will be kept. I am colour coordinating: science is green, math is red, etc... I have 18 students this year, so am hoping to find something that can be put on the shelf in an upright position. I have white plastic containers but don't think they will fit 18 duotangs once the papers start going in. What does everyone use for this? I would love to just have one container per subject. The cardboard upright ones are good, but not sure how much they will hold. And, I was thinking of using these for my teacher books on my bookshelf. Our teacher store here doesn't have anything. I tried Staples, Wal-Mart, Monks, and several dollar stores. Perhaps an online store that ships to Canada? Please include pictures if you have some. My class doesn't have anything in it as I am taking over for someone. I'm starting fresh and want to liven up the room! Thanks!!!