How many 500ml PET bottles will fill a 20ft shipping container?

A standard 20ft shipping container has a volume of approximately 33 cubic meters, which is equivalent to 33,000 liters. Given that a 500ml PET bottle holds 0.5 liters, you can fit around 66,000 bottles in that volume (33,000 liters divided by 0.5 liters per bottle). However, considering packing efficiency and space taken by the bottles, a more realistic estimate would be around 40,000 to 50,000 bottles.