I alway found that my spools of tippet material unraveled in my pocket, so many years ago I bought a Loop Tackle tippet holder,
(http://www.bearsden.com/media/loop_acc_tippetdispenser_lg.jpg)
it works quite well but sometimes it sticks
so looking round for a better idea I found this from the USA
(http://www.dennisonspecialtyflyreels.com/catalog/leader%20dispenser.JPG)
cost about a fiver including Post
I think this could be perfect
Steve