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How the USPS Works (1:21)
Ever wondered what happens to a piece of mail after you drop it off at the post office? Go inside the United States Postal Service (USPS) in this HowStuffWorks video.
How UPS Airlines Works (1:08)
UPS is able to deliver more than four million packages a year because it has the fourth largest airline fleet in the United States. See how UPS Airlines works in this HowStuffWorks video.
How UPS Ball Bearing Flooring Works (0:54)
Ball bearing flooring allows only two UPS workers to move two-ton containers filled with hundreds of packages. See how UPS ball-bearing flooring works in this HowStuffWorks video.
How UPS Cargo Containers Work (0:54)
UPS shipments coming into the central distribution center are transported from planes to the processing line in huge two-ton cargo containers. See how UPS cargo containers work in this HowStuffWorks video.
How UPS Irregular Packages Work (0:57)
Millions of packages flow through UPS distribution centers every day, and not all of them are regular-shaped boxes. See how UPS processes irregular-shaped packages in this HowStuffWorks video.
