I read online about people using business card holders for their RoscoLux flash gels so I hopped over to Office Max and found a tiny one for my camera bag and a larger one for the rest of them…both on clearance. Score.

The smaller one contains all the colors in the Strobist gel pack and the larger one has as many as I could fit. I still have a small stack left so I just bought binder rings to hold those together.