Choose you favorite mason jar size
Get an old leather belt or any peace of leather that you can wrap around the mason jar. I got this belt at good will for $1.99.
Cut the leather to size and mark the wholes where you will be treading the string.
I used a screw driver bit to punch the wholes where the string will go
Cut your string to size and loop it through the holes with the peace of leather wrapped around the mason jar.
Loop the string through the holes and tie it firmly so the leather peace does not come off, you can also use hot glue to secure the leather to the mason jar but this step is optional.
This Cuppow accessory fits perfectly into the mouth of the mason jar with no leaks, I bought mine at amazon for $7.99
Tada!! Done, you can pour your favorite drink, hot or cold and the leather sleeve you just made will prevent that you get burn!!
The barista at the coffee shop will be perplexed when you ask him or her to pour your late into this fancy contrapcion. Enjoy!!