It all depends on the other dimensions of the suitcase and also of the trunk. To illustrate this I am going to use some unlikely dimensions. But they should show that you cannot give a proper answer with only partial information.
Suppose the 22" suitcase has a height of 8 inches.
Suppose the 9 cubic foot trunk has dimensions 36 feet*6inches*6inches ie a long narrow trunk. Then you will not get even a single suitcase in.
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0.116 pounds per cubic inch
10 cubic feet
4.5 cubic foot=7776 cubic inch
It is 7.83 gallons per inch. .785x4x4x1=12.56 cubic feet. 12.56 cubic feet x 7.48 gallons per cubic foot=93.9 gallons per foot 93.9 gallons per foot / 12 inches per foot =7.83 gallons per inch.
How many cubic yards in an 12 foot diameter circle with a 4 inch thickness?