I added this update to the foam ball purse handle tutorial in case anyone else is running into this issue:
UPDATE 1/25/2017: I've noticed that if you use the second method (where you hot glue the strap onto the purse rather than threading the pipe cleaner through the actual purse on either side), the hot glue can lose it's hold. What's likely happening is that there's enough loose glitter that the whole shebang can peel off. If this happens, I would recommend using a nice generous dollop of E6000 between the purse and the hot glue blob. This is a pretty good strategy in general when you encounter hot glue appearing to "peel up" off one surface - the cooled hot glue blob will have conformed nicely to the surface to give you a good contact area and the E6000 is a little stronger but too runny to hold something big in place. I'll try to add some pictures of that process if I get a chance.