I have looked for the answer and have no doubt it is here somewhere. This is probably self explanatory but darned if I can figure it out.
What does SASE mean?
This was my first thought but I figured it was not possible it could actually be that simple! Thank you Dave.
LSASE = Large Self Addressed Stamped Envelope
BSASE or SASBE = Bubble Self Addressed Stamped Envelope or Self Addressed Stamped Bubble Envelope