Carrier

When I started my mail delivery job, they equipped me with a new development in mail delivery: A mail carrier, a sort of partitioned bag which you wear around your waist to easily carry the mail around and have all the letters within hand's reach.

It's become such a natural part of work that I hardly notice it, but it commonly invites jokes such as 

'You carrying a child in that?' or 'Is that a bulletproof vest?' I don't really mind, though, and often shoot back with 'We treat the mail with just as much care!' or 'Well, you never know what could happen in this city.'