I made N a crayon roll during nap time yesterday, using this tutorial. She had long since decimated the cardboard box the crayons came in. They were living in a plastic baggie which she enjoyed playing with, but which I was tired of picking up off the floor to ensure Z didn't choke on it. I made the roll to fit 4-inch fat crayons, so I cut my smaller piece 7" by 21" and ended up with 3" pockets after seam allowances. I made my pockets 1.25 inches wide, which was just wide enough - any smaller and the crayons would not have fit. N was suitably impressed, exclaiming "Wow!" while watching me insert the crayons. I wonder how much longer my sewing will astonish her?
And if I make more of these (and I probably will; they seem to me to be great 2nd birthday gifts), I will cut the ribbon longer than the 20" recommended in the tutorial. For fat crayons, I think you need a 23"-24" ribbon.