Here's how it works: uncheck the checkboxes of the items you do not plan to take. (This is easier than having to check the boxes of the things you do want). Use the blank items at the end of each section to add special items which don't appear in the given list. Click the [MAKE A LIST] button at the bottom of the page and you will get a custom page suitable for printing which you can use on your trip. Happy trails!
Hint #1: Save the final HTML page via the FILE -- SAVE AS menu function. That way you can reprint it whenever you like without having to come back here to regenerate it.
Hint #2: Annotate the list on your trip to add missing items, or delete items you took but didn't use. That way you can refine your list and make it better.