One of the cute things about the Fresh Cut notes are the size! They are 4" x 4". Now, these are a tad bit small to be mailed by themselves. But, let's create a pouch for the card so you can mail it in our medium size envelopes.
Take a coordinating piece of cardstock and cut it at 5-1/2" x 9-3/8". Score in 2-1/2" inches on each end and fold in. Now you have your pouch. Secure the pouch part with Sticky Strip or Tombow Mono Multi Liquid Glue. Insert your Fresh Cut note into the pouch and place the pouch in your envelope and it's ready to be mailed!