List of material job duties in which UPS believes a criminal history may have a direct, adverse, or negative relationship potentially resulting in the withdrawal of a conditional offer of employment: Employees must conduct themselves with honesty and integrity in all their duties, including the ability to safeguard customer and business materials, packages, property, and information with which they are entrusted. Also known as package handlers, many of our warehouse workers load/unload packages in and out of UPS trailers or our signature brown trucks.