To find the total ounces in a package of 6 juice boxes, you can multiply the number of ounces in one box by the number of boxes:
\[ 6.75 \text{ ounces/box} \times 6 \text{ boxes} = 40.5 \text{ ounces} \]
So, the total ounces in a package of 6 boxes is 40.5 ounces.