The assertion that packing is more stressful than checking documents ignores the critical failure of an expired passport or missing visa. This single point of failure can cause the entire trip to collapse, like missing a crucial international flight because of an outdated document. The range of action of such an error is much greater than forgetting a toothbrush or wrinkling a shirt. Stress doesn't come from the task itself but from the consequences if it's not done properly, and an invalid passport is the end of everything.