in Britain they call a mailbag a postbag
英国ではmailbagをpostbagという - 日本語WordNet
Included in the printed matter category is what is called 'special mailbag printed matter'.
印刷物には、特別郵袋印刷物というのがあります。 - Tanaka Corpus
Included in the printed matter category is what is called 'special mailbag printed matter'. 印刷物には、特別郵袋印刷物というのがあります。 - Tatoeba例文
A mailbag from a single sender addressed to one recipient, as the name suggests, is for delivering a bag of printed matter.
同一差出人から同一受取人に宛てて郵袋という、文字通り袋に印刷物を入れて郵送します。 - Tanaka Corpus
A mailbag from a single sender addressed to one recipient, as the name suggests, is for delivering a bag of printed matter. 同一差出人から同一受取人に宛てて郵袋という、文字通り袋に印刷物を入れて郵送します。 - Tatoeba例文