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I’ve been using an old Pantone carrying case I found tucked away at work. Originally there were a few reference books in there, but I use the dividers to split between light, dark, warm and cool colors. Also holds my refills nicely
They may not have one spacious enough for your entire set, but I use and very much like the pen bags from Nock Co. http://nockco.com/
I primarily use the medium Chimneytop - it can hold quite a bit, the stands-up-when-unzipped feature is nice, and after about a year and a half of pretty much daily use has no signs of wear or breakage.
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