The way I understand it in areas that have certain exemptions of the sales tax, certain packaging of the same commodity is taxed where other packaging is not. Like marshmallows. Small marshmallows are not taxed as they are considered food but large marshmallows are taxed as they are considered snacks. Same with certain packages of nuts and chocolate.

Other items would be also I suppose

If we don't count our blessings
We are just wasting our time