Stack the filters you want to bring, then sandwich them between the Front Cap and the Rear Cap. The aluminum shell protects the glass surfaces, so the whole set drops straight into a pocket, a pouch, or the inside pocket of your bag.

The Front Cap is magnetic. The Rear Cap is a hybrid — thread and magnet in one — so a single set holds a BASE Filter that screws onto the lens, a PLUS Filter that attaches magnetically, or a BASE and PLUS stacked together.

When you want to shoot, lift off the Front Cap and set the filters straight onto the lens. There is no case to open and no filters to take out one at a time.

The Front Cap also attaches to the front of a lens already fitted with a BASE Filter, where it doubles as a magnetic lens cap.