Answer: mailbag

AnswerCrossword Clue
MAILBAG

Carrier's burden

MAILBAG

Carrier's carrier

MAILBAG

Letter carrier

MAILBAG
Postal carrier's tote
MAILBAG
Burden for Cliff, in "Cheers"
MAILBAGLetter container
MAILBAGPostman's sack
MAILBAGPostman's tote
MAILBAGPostman's burden
MAILBAGPostal worker's burden