[T.G]

Originally Posted by kelmac07

Very cool...how the hell does it fill from the bottom, with no spillage??? Did David Copperfield invent this?

Magnets. The bottom of the cup is made from two magnets. A ring that is attached to the plastic of the cup and the magnetic surface faces the vessel, and a "floor" that floats up when filling pressure is applied, then snaps back down to seal. The "floor" can be kept for use as a refrigerator magnet.

More info at the first link in my post