PocketWizards also allow you to easily use off-camera flash when shooting in the field. Connect one PocketWizard to your camera and then the second Pocket Wizard  to the flash. I use a transceiver caddy to mount the PocketWizard to the handle of an old hammerhead flash. Press the shutter and, wirelessly, the flash will trigger. You could add a second off-camera flash by setting the second flash to slave mode.

PocketWizard attached to a Pentax AF400T flash

Another useful thing to consider if you are taking PocketWizards into the field is a hard case which will protect the antenna while it is bouncing around your bag. Some are designed to fit with the transceiver caddy making things even easier. This one is by Hildozine.

PocketWizard Hard Case by Hildozine