None.
An inch or a linear inch (which is the same thing) is a measure of length or distance while 26x18x8 appears to be a 3-dimensional measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
In any case, because there are no units given with 26x18x8 it would be impossible to give the answer in cubic inches.
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12 inches IS a linear measure.
Inches and linear inches are the same measurement. Therefore, no conversion is necessary.
Linear inch is a fantasy word from the airliners. It means: X linear inches = length + width + depth (measured in inches). Inches are still inches.
height + width + depth = linear Previous answer: 45 linear inches
It is linear.