A liter (of anything) is the same as a cubic decimeter.
There are an infinite variety of dimensions and shapes it could be
Not much is known about the dimensions of a 3 liter soda bottle. However, they are said to be 28 inches tall.
You can't convert that. Square centimeters is a unit of AREA (2 dimensions), liter is a unit of VOLUME (3 dimensions).
12x12
25
360h x 320dia
A liter bottle can hold approximately 1 liter of air.
Water
The typical dimensions of a 2-liter PET bottle are around 11-13 inches in height and 9-10 inches in circumference.
The millimeter is a unit of length. The liter is a unit of volume. The two units of measure can not be equated.
First you should find out the dimensions of your pick up truck, and then find the dimensions of an individual portable air compressor. Then, with some simple math (truck dimensions divided by the measurements of one air compressor), you'll know how many air compressors you can fit into the pickup truck.
1 liter