I have the Zoot one with the toggles that I like to use because it is more adjustable. I wonder why they make the toggles/snaps so far apart... I've never yet had a bib number that actually fits perfectly onto it, they're always much smaller!

Anyway the toggles work better for me because the elastic part hangs down a bit so you can make it work for a smaller bib better.

But safety pins work too.