Water-bottle holsters are good for more than holding water. I own several Water Bottle Totes by Outdoor Research (orgear.com). With their Velcro-like straps, I can fasten them anywher--to my belt, camera strap, fanny pack, purse, or airplane seat. I've used them at various times to carry my camera, binoculars, snacks, umbrella, battery-powered fan, flashlight, sunglasses, a windbreaker, and a rain poncho.

If you book a package over the Internet, print out all the details of what's included and take it with you. When a hotel desk clerk in Paris said that the breakfast buffet we had enjoyed for the previous seven mornings was not included in our package, I was able to show him the printouts and prove him wrong. He apologized profusely and wiped the breakfast charges from our bill.

When I called to book a hotel room in Budapest, I was offered a rate of $75 per night. After I told the concierge that I was looking for a room in the $35 range, he agreed to the lower price without much fuss. It sometimes pays to barter.

When I'm planning a trip, I almost always call the hotel concierge before I arrive, and if my hotel doesn't have one, I call a hotel that does. Recently, I asked for advice on what to see since I only had four days in a new city. I told the concierge what I thought I should try to do, and she said I had too many things packed into four days. She gave me a list of hot spots to visit and places to avoid, and even recommended a florist to call on for fresh flowers. With her help, my trip was far more enjoyable than it would have been otherwise.

Use an empty M&M's Minis tube to carry quarters. The top holds tightly, but still pops open easily enough, and the size is perfect to slip into a car door or bag. I find it very useful when traveling by car (for tolls and parking meters) and by airplane (for luggage carts or newspapers).

While traveling, I love to send postcards to friends--and also to myself. I get the best photo postcard of the place I visited and write down what I did there as a reminder. When I get home, I tape them in my travel journals so I can flip back and forth between the photo and the reverie.

During the hot months of summer, I plan to travel with a very small spray bottle. I'll fill it with water and use it as a mister to keep cool. I got this idea when we stayed at the Noga Hilton in Cannes. On the dresser was a pink aerosol can full of Evian water. I took it with us sightseeing and, wow, it was so refreshing to spritz water on our faces.

In order to provide any reimbursement for a lost suitcase, most airlines and insurance companies require an itemized list of exactly what was inside it. Unfortunately, remembering everything you packed after the fact is virtually impossible. To avoid the headache, take pictures of the items you're going to put in your suitcase with your digital camera or cell phone. The photos will make creating the list a breeze, and, in the event of a dispute with the airline or insurance agent, you have some visual evidence of ownership.

We rented a car last summer to tour northern Italy. Initially, we contacted Europcar (europcar.com) and got a quote of more than $500. We then clicked on a rental-car link from Best Fares (bestfares.com) and received an offer that knocked off about $50. When we mentioned to Europcar that we'd seen lower offers on the Web, they told us that if we sent them the URL and they could verify the offer, they'd match it. We eventually found a car that was an additional $100 cheaper from a British company. Europcar-which offered better service for our itinerary-accepted that lower price, saving us $150.

Ever since my children were small, I've carried recent, wallet-size pictures of them when we all go on vacation, in case we get separated. Now that they are teenagers and traveling with friends' families, too, I send pictures for the other family to bring along with them. I also write my telephone numbers on the back of the pictures so they know where to reach me in an emergency.

Use the shoeshine mitt often found in hotel bath- rooms to store your sunglasses. They fit nicely inside the pouch, and when you take them out, you have a soft material to clean them with. For extra protection while traveling, I store my sunglasses inside the shoe-shine mitt, fold the end closed, and then place it in my glasses case.

I carry recipe cards with me to jot down interesting dishes I come across while on vacation. (I also like to use colorful postcards from the area I'm visiting and trim them to fit my recipe box.) Here's a wonderful dessert idea I brought home after spending a rainy afternoon with my husband in a London pub: Top a warm waffle with vanilla ice cream, maple syrup, and chopped pecans. It's heaven with a cup of hot tea.

I reverse the batteries in my portable CD player before packing it in my suitcase or backpack, in case it's accidentally turned on when my bag is jostled. I came up with the idea after arriving at my destination to find that the brand-new batteries I'd put into my Walkman were dead.

Create your own postcards by writing on the back of photographs that you've taken and developed while still on your trip.

I used to lug around a clothes steamer and adapter to stay wrinkle-free while on the road, but I've since opted for something more low-tech. I now travel with a Platypus collapsible bottle and a spray bottle head. After checking into my hotel, I immediately hang my clothes and give them a spritz with water from the spray bottle. After several hours, the wrinkles fall out, and the clothing is dry and ready to wear.

I was booking tickets online for an upcoming flight to Europe from the East Coast. One particularly attractive fare was offered on a U.S. airline as well as on its foreign "partner airline." Same plane, same flight, same base price. But it was more than $100 cheaper per ticket to book with the foreign airline versus the U.S.one. We saved more than $400 for four tickets, but we'll be on the same plane!

Don't assume a single room costs less than a double one. I booked a hotel in Spain online and noticed that rates were the same whether I booked a single or a double, but the single was much smaller and its bathroom had only a small shower stall and no tub.

When buying bottled water, look at the bottle cap to see if the seal is still intact. While visiting the Acropolis on a very hot day this summer, I caught a young boy refilling empty water bottles from a tap and recapping them. He was then selling the bottles to thirsty tourists.

We decided to take our bikes on our last Caribbean cruise. It was a little crowded in the cabin, so the steward let us store them down the hall with the wheelchairs. We were last off the ship when we docked in Bermuda, but after five minutes we'd left our fellow passengers in the dust. And in less than fifteen minutes, we were far away from the busy port, enjoying a beautiful, deserted snorkeling beach.

You can suspend more than your newspaper when you're away. On several occasions, DirecTV has agreed to put my account on hold while I was traveling--without penalties, additional fees, reconnection charges, or the like. So, instead of a monthly bill of $65, mine gets prorated.

When my husband and I travel with our children, our luggage is weighed down by diapers, formula, and other necessities. To save space and hassle, we now ship ahead most of those items to our hotel. We also came across a Web site called babiestravellite.com, where we can order supplies and have them shipped anywhere in the world.

As a flight attendant, I'm always amazed by the stuff that people leave behind. Most of it never gets back to its rightful owner because there's no way of knowing who the owner is. To avoid misplacing your property, put things back into your carry-on after using them--never on the floor or in the seat-back pocket. Label important items like books or games with return address labels so they can be sent back to you if found.

If you even manage to get a cell signal while at sea, your roaming charges will be outrageous. To communicate with your cabinmates, leave Post-it Notes on your door detailing where you'll be throughout the day.

I always pack several tea lights, a small vial of essential oils, and matches. Tea lights, when placed in a water glass for extra safety, banish stale or unpleasant smells in hotel rooms. The essential oils work wonders when a drop is placed on a warm lightbulb.

If you know you'll be cooking while on vacation, bring along small amounts of the spices you need for your favorite recipes. You'll save by not buying large containers of spices.

Most cruise lines offer certain drinks for free--juice, lemonade, iced tea, coffee, milk, tea-but you'll have to pay for soda. If you're a caffeine addict, pack a bottle or two. Unlike on a plane, you won't have to worry about paying for the added weight.

Bring your own linens. They're useful in a million different ways. Obviously a soft cotton pillowcase makes those scratchy airplane pillows bearable, but it can also be used to gather loose items when deplaning. A nice sheet will cover up an ugly bedspread or sofa, and makes a great tablecloth or picnic blanket.

Carry the exact change for public transportation. In Venice, we were annoyed when a vaporetto (water taxi) ticket-taker refused to give us our change. Later, we discovered that if you don't have the exact fare, ticket agents make no promises about giving change.

I always take a digital picture of the gas gauge to prove that I returned the rental car with a full tank. Some agencies try to charge for a minimal amount of gas when they "top off" the tank (which you're not supposed to do anyway). I've used these digital photographs to get refunds for gas charges that appeared on my credit-card bill after the fact.

Cruise lines offer packaged side trips at their ports of call. If you go online and look for these expeditions ahead of time, you can book directly with the tour companies and save money.