No such requirement. Use whatever you want.
(I was tempted to say “It has to be on official LEGO poster-board, but at this point in the season, that would be cruel!)
Is there a FLL prescribed poster "board size", or is the organization flexible if one used a little bigger or smaller board?
We are re-using an old packing board, which is a little bigger than the regular tri-fold poster boards available in Staples etc; wanted to ensure we are not violating any "board size" requirements.
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