Going to step on a lot of toes here but I think that those expensive little spools of tippet are a total rip off!! Yeah sure you get these neat little spools of tippet you can hang around your neck to look cool or stuff in your vest with those little holes to tail it out of! A 110 yard filler spool of 2# test (7X) flourocarbon costs about 1/2 of a 30 yard spool of Tippet! I pre make my tippets and pack them in little baggies in my vest, 4-6' with a double surgeons loop. A 1/2 dozen pre made tippets take up about as much room as that over priced "Tippet" spool! And, they are a lot quicker to change!
Yes, I know I have strayed from the path of truth and may the gods forgive me.