Which mailing service is best suited for sending heavy documents urgently?

The best choice for sending heavy documents urgently is Priority Mail Express. This service is specifically designed to provide fast and reliable delivery for time-sensitive items. Priority Mail Express guarantees delivery typically within one to two days, and it includes tracking and insurance up to a certain value, which is essential for important or valuable documents.

This service also offers convenient features such as a money-back guarantee for late deliveries, which further emphasizes its reliability for urgent mailing needs. While other options like Priority Mail offer expedited services, they do not guarantee delivery times, making Priority Mail Express the superior choice for urgent and heavy shipments.

In contrast, First-Class Mail is generally used for lighter, less time-sensitive items and may not be the best option for heavy documents due to weight restrictions. Parcel Select is more geared towards bulk shipments and commercial use, lacking the express features necessary for urgent individual mailing. Thus, for sending heavy documents that require fast delivery, Priority Mail Express stands out as the most suitable service.