Joe,
That contradicts their own order. I've always found when in doubt follow the written rules. They may change it next year but that is next year. I was told by the staff at ESIVC in 2009 and 2010 the Ursack was legal. When I was told in '09 it was ok, I searched their website for the memo, which I found. If they want to change the rules in 2011, I will comply. Until then, I will use my Ursack when traveling exclusively in the INF.
I've products manufactured by Garcia, BV, Ursack and Wild Ideas. I do not particularly care for Garcia or BV products. I will use my Ursack wherever it is legal and my Bearikade where it is not.