Unless they changed the design, the 5.0 cu ft Holiday can hold three cornies and a #5 CO2 tank. Because that's what I've got. I put a collar on mine, but there is plenty of clearance without it if you prefer a tower.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk