An entire roll of Reynolds Freezer Paper (50 square feet)
12.1m long by 38cm wide (13 1/3 yd x 15")
if you've not heard about the magic of Freezer Paper in Felt Craft here are some links
http://www.craftsy.com/blog/2012/10/fix-it-friday-help-my-felt-shapes-are-never-quite-right/
http://betzwhite.com/2013/09/felt-lore-part-6-freezer-paper.html#.U6bx3bEVeNw