Which of the following is an example of an outside parcel?

An outside parcel refers to a piece of mail that is larger than a standard letter or envelope and typically includes packages or boxes that fall outside the standard dimensions of regular mail. A metal-strapped box fits this definition well, as it is likely a larger, rigid package that is suited for shipping items in a way that protects their contents. Such a box requires special handling and can often be sent using different shipping services based on weight and size.

Standard envelopes and flat rate boxes, while they can be used for shipping, often still fall under regular mail categories or rates that do not classify them as outside parcels. Machinable parcels typically refer to those that are suitable for processing by machines, which might still align within certain postal dimensions without being categorized as outside parcels. Thus, the metal-strapped box is clearly an example of an outside parcel due to its size and structural characteristics.