Please reason step by step, and put your final answer within \boxed{}.
Karen’s work tote bag is twice the weight of her husband Kevin’s briefcase when the briefcase is empty. To complicate things, on rainy days, Kevin also carries an umbrella that weighs half as much as the empty briefcase. When Kevin puts his laptop, work papers, and the umbrella in his briefcase on a rainy day, it is twice the weight of Karen’s tote. Kevin’s work papers are a sixth of the weight of the contents of his full briefcase, not including the umbrella. If Karen’s tote weighs 8 pounds, how many more pounds does Kevin’s laptop weigh than Karen’s tote on a rainy day?
user