I made this quick video on how to attach them. I've made HUNDRED's of masks.... I find this reshaped paperclip really works best.
The crochet hook is just terrible. Don't waste your money! The bobbi pin and twist ties work ok but it requires and pinch and pull. This is difficult for some people. I think the paper clip works best because of the hooks on both ends. You can hook your finger to the larger one and pull.
If you'd like to purchase some toggles, masks or pouches, I've set up an Etsy shop as well as one on Ebay. I do have different stuff so be sure to check them both out.
Until next time, be safe and take care!