Check your existing insurance policies and credit card coverage before you buy travel insurance. You may already have coverage for lost luggage, canceled tickets, or medical expenses. The price of travel insurance varies widely, depending on the cost and length of your trip, your age and health, and the type of trip you're taking, but expect to pay between 5% and 8% of the cost of the vacation.

Trip-Cancellation Insurance -- Trip-cancellation insurance helps you get your money back if you have to back out of a trip, if you have to go home early, or if your travel supplier goes bankrupt. Allowed reasons for cancellation can range from sickness to natural disasters to the State Department declaring your destination unsafe for travel. In this unstable world, trip-cancellation insurance is a good buy if you're getting tickets well in advance -- who knows what the state of the world, or of your airline, will be in 9 months? Insurance policy details vary, so read the fine print -- and make sure that your airline or cruise line is on the list of carriers covered in case of bankruptcy. A good resource is "Travel Guard Alerts," a list of companies considered high-risk by Travel Guard International (see website below). Protect yourself further by paying for the insurance with a credit card -- by law, consumers can get their money back on goods and services not received if they report the loss within 60 days after the charge appears on their credit card statement.

Note: Many tour operators include insurance in the cost of the trip or can arrange a policy through a partnering provider, a convenient and often cost-effective way for the traveler to obtain insurance. Make sure the tour company is a reputable one, however: Some experts suggest you avoid buying insurance from the tour or cruise company you're traveling with, saying it's better to buy from a "third party" insurer than to put all your money in one place.

For more information, contact one of the following recommended insurers: Access America (tel. 866/807-3982; www.accessamerica.com), Travel Guard International (tel. 800/826-4919; www.travelguard.com), Travel Insured International (tel. 800/243-3174; www.travelinsured.com), and Travelex Insurance Services (tel. 888/457-4602; www.travelex-insurance.com).

Medical Insurance -- Most health insurance policies cover you if you get sick away from home -- but check, particularly if you're insured by an HMO. If you require additional medical insurance, try MEDEX Assistance (tel. 410/453-6300; www.medexassist.com) or Travel Assistance International (tel. 800/821-2828; www.travelassistance.com; for general information on services, call the company's Worldwide Assistance Services, Inc., at tel. 800/777-8710).

Lost-Luggage Insurance -- On domestic flights, checked baggage is covered up to $2,500 per ticketed passenger. On international flights (including U.S. portions of international trips), baggage coverage is limited to approximately $9.07 per pound, up to approximately $635 per checked bag. If you plan to check items more valuable than the standard liability, see if your homeowner's policy covers your valuables, get baggage insurance as part of your comprehensive travel-insurance package, or buy Travel Guard's "BagTrak" product. Don't buy insurance at the airport, where it's usually overpriced. Be sure to take any valuables or irreplaceable items with you in your carry-on luggage because airline policies don't cover many valuables (including books, money, and electronics).

If your luggage is lost, immediately file a lost-luggage claim at the airport, detailing the luggage contents. For most airlines, you must report delayed, damaged, or lost baggage within 4 hours of arrival. The airlines are required to deliver luggage, once found, directly to your house or destination free of charge.