IPA: /ˈmeɪlˌbæɡ/
KK: /ˈmeɪlˌbæɡ/
A bag that is used by postal workers to carry letters and packages while delivering mail.
The mailman filled his mailbag with letters and packages for the day.
Mailbag → The word is formed from "mail" (from Old French *male*, meaning a bag or pouch) and "bag" (from Old English *bagga*, meaning a sack or pouch). A mailbag is essentially a bag used for carrying mail.
Think of a 'bag' that is specifically used for carrying 'mail' — that's what a mailbag is.
No commonly confused words.