Step #1: FoldPrevNext
Fold the bill(s) lengthwise making a crisp corner.
Step #2: Fold AgainPrevNext
Make another fold width-wise about 3/4" from the bottom end of the bill(s).
Step #3: Put in CoinsPrevNext
Prepare the exact change and insert it into the folds.
Step #4: PresentationPrevNext
Squeeze the bill/change packet at the fold and present to the drive through agent as a single monetary unit.