It's a taster collection of small portions of cereals or biscuits/cookies.
Interested in Language
I’ll be out at the bars every night.
At a table next to the wall, there’s a group of girls, probably college students, two blondes and three brunettes, all pretty but in different ways, like a variety pack of your favorite kinds of cookies.
'Spectacular Now' byTim Tharp.
Explain to me, please, what is variety pack.