What types of items are included in outside parcels?

The correct choice highlights that outside parcels include items that cannot be accommodated within postal sacks. This category typically encompasses larger packages that exceed certain size limits, making them unsuitable for standard postal handling processes like those used for sacks.

This classification is significant in the postal service as it helps in categorizing and managing items appropriately, ensuring that each parcel receives the correct handling and transportation method. Outside parcels require specific considerations for delivery, which may include different pricing, routing, and physical handling processes compared to smaller items or typical mail.

In contrast, other options suggest limitations that do not accurately define outside parcels. For example, stating that only small packages or envelope-style packages are included would not encompass the larger and more varied range of items that are classified as outside parcels. Furthermore, asserting that all types of mail fall under this category is misleading since many items do fit into postal sacks and do not require the same handling as outside parcels.