Well, electrical tape, but... I found a file with the frankenstrat pattern and used image editing software to expand it to the proper dimensions. I sent it to them and they printed it on Dyneema.

Oh. gee, I'm sorry you spent so much money on a custom backpack and then had to use so much duct tape on it.  Oh, wait....  

I have always expected youth to address adults as "Mr Lastname" or "Mrs Lastname".  My boys are 40 and still address their former SM as "Mr."  .  And I hate when friends tell their kids to address me as "Mr Firstname".  Guess I'm just old school and was taught to show respect to my elders.   

It depends, how does the adult want to be addressed? Growing up, we had a LtCol. in various positions. He was also a MD.  We addressed him as "Doc _____________" or just plain "Doc" In my middle son's den, his DL was an MD, but went by "Mr. _______________"

You summed it up quite nicely. At times, I use the Mrs./Mrs./Ms. so much, I even use it during committee meetings, but no one seems to mind. It is hard to "code switch" at times.