The sets of double pointed needles I have are usually rolling around somewhere they shouldn't. There is always one missing. They are too short for the needle case I made and they fall out of the cardboard pack they are sold in.
I have made individual pouches for each set and have made three so far.
They simply fold over and fasten with a fancy button.
I will now be able to find a set quickly and easily - that's the plan, anyway!