The plane ticket, hotel reservations, and car rental are easy. What's not so simple is the decision to buy the array of additional perks, products, and add-ons available to travelers prior to departure. Should you insure your trip? Do you really need those extra inches of legroom? Is an expedited-passport service worth the cost? We have the answers. In the interest of saving you money, we've rounded up seven things that you can probably do without on your next trip. Think twice before handing over your hard-earned money for the following products and services.