Sack on a red-white-and-blue truck, which can hold the ends of 21- and 54-Across and 3- and 35-Down

Now we are looking on the crossword clue: Sack on a red-white-and-blue truck, which can hold the ends of 21- and 54-Across and 3- and 35-Down.
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Possible Answers: MAILBAG.