Jim has the link to the USPS.COM site for all the rules on envelopes/flats/parcels TY JIM.

In the mean time I might get some of the safe-t-mailer things from http://www.safetmailer.com/

By far the cheapest price for them as I could find/free shipping.

Now you Starbucks experts-is the cardboard holder the same thing? You guys go buy a cup and take a dozen or you just take a dozen holders and do not buy anything? Just asking?