Collectively, we've touched down on every continent on earth and we're closing in on every country. But we're nowhere near perfect travelers. Every one of the travel chokes on this list comes from painful personal experience - often multiple times repeating the same mistakes. (We're nothing if not persistent.) What are your biggest travel mistakes? Add them to the list in the comments section below. 1. Overpacking At home, with your complete wardrobe available, there's no reason not to run through work, workout and working-the-clubs outfits in a single day. But when your life is crammed into a couple of bags, your fashion morality changes. Those socks you wore on the plane should be good for another go. The purple tee you slept in ought to be alright for a third wear. Yesterday's undies? Well ... According to a recent survey by Travelodge, two-thirds of travelers typically return from a trip with at least six unworn outfits. The lesson: You don't need a new set of anything for each day of a trip. Figure on at least two wears for (almost) everything. 2. Not buying something you like as soon as you see it You think you're gonna circle back to that shop. You think you'll see a cheaper, better version somewhere else. You won't. That evocative street painting or those Metallica nesting dolls you didn't buy? Now not having them will haunt you for the rest of your life. When you see something you like, just buy it and live without regret. 3. Not checking your phone plan before traveling abroad What you call "international roaming" your phone carrier calls "shareholder dividend!" A week of texts from Singapore or St. Lucia shouldn't cost more and hurt worse than open heart surgery. But it happens all the time to travelers who fail to check their phone plans before departure. 4. Trusting "near city center" descriptions "Near city center" is like a Bible verse -- open to vast interpretation. When you find the money you saved on your "near city center" hotel is being spent on 30-minute commutes and outrageous taxi fares, you know you've committed one of the cardinal sins of travel. Related note: Except by purely technical definition, if you're staying near the convention center in Portland, Oregon, you're decidedly not staying "downtown" (as is popularly advertised) by any local sensibility. 5. Taking the "super" shuttle Wait on the curb for a ride in a sweat-soaked van and risk being the last one dropped off on a nine-hotel run, all in the name of saving a few bucks? Your time is worth more than that. Adam Carolla brilliantly sums up this classic travel blunder in his book, "In Fifty Years We'll All Be Chicks." "The shuttle is the worst $20 you'll ever save. It adds 90 minutes to whatever a Town Car or cab would have been. You have the unenviable choice between being dropped off last or being dropped off first and having a bunch of losers who can't afford cab fare and have no friends or loved ones with cars knowing exactly where you live." 6. Not tightening shampoo caps ... all the way Those cute, little trial-size shampoo and conditioner bottles are really handy -- until they magically burst open in-flight, spreading a layer of glycerol soap snot all over your bag. 7. Thinking you know the perfect time to book a ticket There's an art to reading the tea leaves of the airlines' protean pricing schemes, but there's some muddled science to it, as well. According to Travelers Today, research conducted by Kayak found the optimal timing for a cheap-ticket purchase is 21 and 34 days before domestic and international flights, respectively. But 2012 analysis by CheapAir.com concluded that on average the cheapest fares are found 49 days before a flight. Meanwhile, researchers at Texas A&M University simply found that Saturdays and Sundays are best for finding discount fares. The golden rule? There's no golden rule. Tickets are cheapest when they're cheapest. Editor's note: The original version of this story reported that CheapAir.com claimed the optimal ticket-buying time is 79 or 81 days prior to a flight. The error has been corrected. 8. Trying too hard to chisel out a bargain There's no faster way to become embittered with the locals than going toe-to-toe with a market full of hungry sales people and shopkeepers. Yes, we understand there's principle involved, but do you really need to whittle the equivalent of fifty cents off the price of an embroidered handbag that's going to sit in the back of a closet anyway? Just buy the damn thing and spare your heart the cortisol burst for when it actually needs it. 9. Not changing money at the airport When traveling internationally, the conventional wisdom is that only amateurs change money at the airport, because the exchange rate for foreign currency will be better in town. It usually is, but often not by that much. A recent check of the dollar-to-pound exchange rate in London Heathrow was $1.71 to £1 (with no commission for changes more than $300). Near Oxford Circus the exchange rate was advertised at $1.62 to £1, also with no commission. Using these rates, converting $300 at the airport would get you £175.43 as opposed to £185.18 on the street. So, you can hit the city like a cashless bumpkin and spend an hour hunting up an acceptable place to change money or, for less than £10, arrive with some local coin in your pocket. Convenience factor alone makes it worth changing at least a nominal amount of cash at the "ripoff" place at the airport. 10. Underestimating the hell that is Heathrow Speaking of London, it's easy to underestimate the several hundred miles of concourse you'll likely be obliged to traverse and the time-consuming security searches that create jumbled queues and make travelers look more like internment camp refugees than cosmopolitan jet setters. Arriving anything less than two hours before an international flight is risky, but even a longer cushion can get dicey. Imagine walking across a football stadium and you start to get an idea of the Andean trek from the Heathrow Express station to the swarm of travelers clamoring to get on lifts that will take them merely to their start of the Oz-like journey through Terminal 1. 11. Buying cheap flip-flops You think, "I'm only gonna wear 'em for a week, I might not even take 'em home, why buy the good ones?" The answer comes when you blow out a toe strap and shred the bottom of your foot a mile into a hike across the local lava beds. And now you have to go back. 12. Fearing street food No one wants to get sick on vacation, but why travel all the way to Thailand or Mexico and not eat the local grub? The locals don't like food poisoning any more than you do. If they're in line, consider the place vetted and assume you're going to be fine. (Cue angry commenters with the "I almost died from a tainted falafel" and "the locals are immune to bacteria" histrionics below.) 13. Buying a drum on the first day of a three-month trek across Asia We know, this is the antithesis of travel mistake number two, but there are some balls and chains you really don't want to lug around the subcontinent. Not because you'll make instant enemies with everyone in your hostel when they spy you struggling top-heavily into the dorm, but because a) you'll never play the thing, and b) you'll get back home, walk into the new Authentic Beats music shop that replaced your favorite bookstore while you were away and find 10 superior examples of your exact instrument. 14. Over-reliance on guidebooks Making a travel plan using only your guidebook is like making a plan to stand in line at the bank for a week. Guidebooks are great - we use them all the time -- but it's best to pull just one or two suggestions per day from a guide that thousands of like-minded travelers have read or downloaded. 15. Not buying the full insurance policy We're not a bunch of free spenders - except when the boss whips out the company credit card at the pub - but a lot of the mistakes on this list come down to adding a significant amount of stress to your life in the name of saving a few bucks. If you actually end up needing the travel insurance you purchased (a move a significant percentage of our staff thinks is silly in the first place), you're going to want the full coverage. Just because you're in a country where the beer is cheap, it doesn't mean the healthcare is. That bargain insurance policy might pay for your flight home when you crash your motor scooter on a winding road in some island paradise. But it won't cover the $5,000 in stitches and sponge baths you racked up during your three-day international hospital stay. 16. Obsessive photography The obsession/obligation to document every street scene, statue and starter course kills the spontaneity and visceral experience that should be the backbone of travel. It's now so easy to take photos that one click leads to another. Before you know it, you have 300 pictures on your phone comprising old buildings, blurry sunsets and plates of food. Congratulations. Your trip is now defined by low-quality images on a handset that, trust us, nobody back home wants to spend 20 minutes scrolling through. 17. Not checking visa requirements before departure Carnival Rio! It's a nightmare come true when you get turned away at the ticket counter on departure day because you didn't realize Brazil requires citizens of your benighted country to secure a visa before travel. 18. Attempting Berlin in a weekend At 344 square miles, Berlin is a metropolitan Goliath, larger than New York City (301 square miles), and, as the first-time visitor quickly learns, with just as many places to see, eat, drink, shop and get lost. 19. Using a credit card to get cash This is the fastest way of paying through the nose for the privilege of paying through the nose. Credit card companies charge a high transaction fee (up to 15%) for using a card to get cash. These special transactions also attract a higher associated fees than other purchases: the ATM-owning bank will charge a fee; if you're withdrawing a foreign currency the exchange rate will be miserly; and if you're not paying off your balance each month, credit card companies in some countries will apply your partial payments to normal purchases (with a lower interest rate, say 9%) before applying them to those cash advances (which have a much higher interest rate), milking your desperation for every pitiless penny. 20. Not printing out reservation details They're already on your phone and computer, so why bother with hard copies of your hotel name and address? Because your phone, computer, tablet and other electronics might not work with the local network as soon as you land, especially after crossing oceans. Now where are you supposed to go?

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