I try to leave at least a few things for adults, but most of the traders are for kids as a lot of adults do not trade. I like to leave the following items. Some of which can be used elsewhere caching are tennis balls, bungy cords, AA's of course, flashlights, emergeny Blanket or poncho, playing cards or small games, small tools, picture frames or bookmarks,
keychains, cell phone holders, etc.