My family made a stamp with all of our caching names around the "Miller Clan" name when we get together to cache. It has made it alot easier and we all have our names recorded on the log. (Which I thought was required or the owner can delete the name(s) that do not appear on the offical log.)
When I'm not with family, the one who finds the cache gets to write down everyone's name while the rest of us looks at the swag. We are looking into getting the micro labels that I can make on the computer.. Then I can change the names to whom is caching that day with me.
