A human being can fit into approximately 2x2 feet cylinder. I propose packing the entire accessible Universe with a human being per such cylinder stacked alongs

A human being can fit into approximately 2x2 feet cylinder. I propose packing the entire accessible Universe with a human being per such cylinder stacked alongside each other with no padding/margin between cylinders. We will thus avoid shrinking into extinction and maximally populate all available 3-dimensional space.