I use a regular household file, the sort with a fold over lid and handle, to store offcuts of card. I sort them by colour. It's easy to find the colour I need. I place all the similar shades in the same section in a penny pocket so when I need to use, i.e.: red, I just need to take out the reds. I also find it so easy to take with me if I am doing a charity craft session.
It's also useful for card toppers, ie: birthdays, with all the different styles, even the greeting off other cards that can be recycled. There is also less waste as none get damaged or lost. This is a big help when you need to use a portable carrier away from your studio.
By Mary from United Kingdom
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To keep my 8.5 x 11 cardstock organized by color I use a vertical cardboard magazine holder that I have covered with decorative paper to look pretty in my craft room.