So we've had the sporty bum bag and here is the formal bum bag - characterized primarily by the oh-so-sophisticated use of material - namely snakeskin.
I predict the snakeskin / sporty combination as the next big thing in bum bags /fanny packs. They are already fairly dorkus so why not go the whole hog.
Combined with a floral shirt... apparently anything goes.
And all you designers out there- if you are not sure whether you choice in snakeskin is formal enough, just add a bow tie.