From Halopedia, the Halo wiki
The Transit Box DR44 is a storage container that was used by the United Nations Space Command during their war with the Covenant. The containers are made of ballistic-rated materials and feature GPS tracking, environmental sealing, and wireless access to packing lists. Despite their advanced countermeasures, DR44s were often mistakenly sent to the wrong location. Used by both the Office of Naval Intelligence and the military at large, DR44s were often shipped using 463L Master Pallets.