If you wear those enamel pins that have become really popular again, buy these. Don't use it if your uh...poky backing part is bent. You're gonna end up breaking the pin, js. But they are a godsend because your expensive enamel pins aren't going anywhere.

And this tiny af mini griddle. It really is mini, but I have a really stupidly tiny appetite. I actually plan on bringing it with me to hotels >_> Convention food is way overpriced.

I've used these: https://www.amazon.com/SUBANG-Pieces-Locking-Keepers-Storage/dp/B01LYS7N9J/ref=sr_1_1_sspa?ie=UTF8&qid=1529702314&sr=8-1-spons&keywords=locking+pin+back&psc=1

They stay pretty good and you don't need a tool.

I bought these: https://www.amazon.com/gp/product/B00J5DT4LO/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

and these: https://www.amazon.com/gp/product/B01LYS7N9J/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

Love both of them. I lean ever so slightly towards the former, as they are freakin' LOCKED ON with an allen screw. The latter are real easy to put on, and are so secure I have a little difficulty getting them off sometimes. Not sure of the mechanism of the latter.