I've also thought about Zebco Omniflex. I got a 700 yard spool of 10lb for $1.97. Thought about getting a spool of 4lb for tippet. I'm glad to know not to buy into the marketing hype of it has to be labeled tippet.
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The Omniflex would work fine, too. I mentioned the other line because the spools are similar in size to tippet, and you can easily slip a couple into your pocket.