Place the cap on each marker when you are not using it. Use caps even when you are going back and forth between different felt tips. The more pens are exposed to air, the faster they will dry out.
Snap the caps on the markers when you put them in storage. You want to hear a snap sound to ensure the pens are fully sealed.
Put the pens on your desk in a pen cup for easy access. If you don't plan on using them often, place the pens in a desk drawer. Keep the pens in the vinyl packaging that they came in so you can find them easier.
Store felt tip pens with the cap facing upward. If you face the pens downward, they have more of a chance of leaking either in the cap or in your storage space.