Since the long notes are rectangular, I don't think they're considered an unusual shape by the postal service. The sorting machinery cannot easily orient square envelopes for automatic scanning, and that's why they cost extra.
__________________ Rachel
Proud SU! demo and Sci-Fi Geek!
My Stampin' Up! blog
"I'm a time traveler -- I point and laugh at archaeologists." 10th Doctor, "Silence in the Library"
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