I now maintain my travel checklist in a Notion Document (follow this link).
Significants updates to checklist:
2022 October: Moved to Notion. Added portable fitness/workout equipment category.
2014 February 9: Revision 4. Updated to keep up with the times.
2010 January 24: Revision 3. Updated to reflect changes due to popularity of products like smartphones.
2001 July 20: Revision 2.2.