I am looking for a “packing” list rather than a To–Do app. The Palm PDA had an app that had three views: the total list of items to consider, the list (view) of checked items, and a list of unchecked items. This list could be reset to uncheck the (checked) items so that the list could be used to repeat the actions needed. The reusable list was a simple listing of items (actions, for example), was easy to use while packing, and was easy to maintain.
Most To–Do lists are intended to be a reminder of some to–do action. Once completed, the To–Do app wants to delete the checked item or to file the item out of sight. The list is not instantly reusable.