Digging around in the dark pockets of a camera bag is frustrating. The ToolPak is designed to help solve this problem. It will hold filters, batteries, pens, pencils, screwdrivers, a small notepad and most of the small accessories that are difficult to find when you need them. It folds and closes with Velcro so it will fit into most camera bag pockets. It is made of Tamrac's exclusive Windowpane-Mesh so the contents are easy to find. Most of Tamrac's Pro Series camera bags have attachment systems designed into the ZipDrop pockets so the ToolPak can be attached as a component of the bag.