Quick loading and unloading of reels; quick, easy line changes on the water; easy handling in conjunction with rod and reel. Load ‘em up. Travel — select the lines you need for each outing, clip them together and throw them in your gear bag - find them when you need them; robust but light; protection against salt and grit. Stack — clip them together for simple organization out in the field and when you get back home. Label your switchboxes for easy line identification. Sort them, stack them, store them.