There's a disease that seems to be common among all types of artists and crafters, from calligraphers to knitters. Although we have ample supplies already, there's just something that makes it impossible to pass up any good finds at the local Jo-Ann's or Hobby Lobby. Sewers and knitters have their systems for making some sense of their piles of supplies, and tatters have come up with their own creative solutions for storing threads. The first thing you'll want to do is decide how you'd like to categorize your threads.
Some popular classifications are by color, by size or by manufacturer.
Divide your threads into groups and get an idea of what size containers you'll need to hold them all. Clear boxes are especially useful for allowing you to see the contents without taking off the top. Small, sectioned plastic boxes can be used for smaller sized threads such as 80. Craft stores often carry large plastic organizers made especially for crafters. They sometimes have handles to allow for easy toting, and the top usually has a hinged lid.