Johnny:

Bass Pro just made a mistake. I got my info from Berkley and as you already discovered, other websites have the diameters correct. You won't see any inconsistency on the Berkley packaging and that 's what matters most.

While taking ALL tippet & line manufacturers stated diameters and strength with a grain of salt is a good idea; with fishing line it really doesn't matter as much as it does with tippet, especially in the small diameters.

For the record I'm a big Berkley fan for my non-flyfishing and while I never used Vanish as leader material; it is my line of choice on most of my baitcasters and is great stuff!!