Zulu Nylon Gear’s new Pen Stackerz look to be very handy. These are basically hook backed elastic tubes that are designed to hold pens, markers, chemlights, string cheese, beef sticks, and other gear of a similar size and shape. These can be used anywhere you have loop material like on the front of a plate carrier or inside a loop lined backpack.
There are two different configurations, single and double. The double is design to accept the single so that both units can be stacked together to create a triple. In addition to the hook backing, they are available with integrated D rings or HK hooks for additional mounting options.
Check out Pen Stackerz at Zulu Nylon Gear.