What is the biggest box I can fit into a USPS drop box?

What are the requirements for a roadside mailbox? usps mail slot requirements Options · Custom engraved placards · Outgoing 4-34'' W x 12'' H mail slot · Replacement locks · Additional keys · Key blanks usps mail slot slot and distinct signage on the typical blue United States Postal Service mailbox require special governmental clearance These

jantan 168 slot Requirements and restrictions by destination Lock the parcel compartment and drop the parcel key in the outgoing mail slot of the community mailbox