From Loon Outdoors:
RIGGING FOAMS : RIG AT HOME & FISH ON THE WATER
No matter how much you enjoy rigging your gear… packing your bags, loading your fly boxes, tying on bugs, applying floatant, reorganizing your boat box…. our guess is that you’d rather be fishing than rigging. And if you’d rather be fishing, then why are you wasting time (and missing fish) rigging flies once you get to the water?!? With the Rigging Foams you can easily rig multiple set ups so that you’re ready to fish as soon as you get to the water and ready to change flies as soon as the fish change their minds.