Less is More: For a two-week European vacation, I always use a 22” roller board and have never wished I brought more. In fact I usually wind up not using about 20% of the things I bring. My wife typically does the same, but if traveling during colder seasons, she sometimes takes and checks a larger suitcase. You might be surprised with how little you can get by with on a two-week trip. When it comes to packing, “less is definitely more”.
Getting Thru the Airport: Carrying-on your luggage allows you to get off the plane, thru immigration and the airport much quicker than if you have to first claim your checked luggage. On the flip side, it can be a hassle carrying on your luggage if it’s a full flight and/or if you don’t have high seating priority. But most airlines let you pay (≈$25 per person) for priority boarding, which can be worth it if you want to carry on.
Wheels or Straps: Bring suitcases that either have wheels for pulling or shoulder straps for carrying like a backpack. Without one of those two options, you’ll be stuck carrying your luggage and/or paying porters to carry them for you. This can be especially important if, for example, you find yourself walking a several blocks from a Metro station to your hotel.
Wrinkle Free: Best if you can buy to wrinkle-free or wrinkle-resistant clothing. They pack well, stay neat longer and if you have to wash something in your bathroom sink, it will come out looking reasonable enough to wear.
Tidy-Whities: All underwear (boxers, briefs, panties, t-shirts, bras, slips, socks, etc.) should be made of synthetic material. I prefer natural fibers in my daily life, but going synthetic on the road allows you to wash these items in your bathroom sink as necessary and they almost always dry overnight. Going this route also lets you get by with only 2 or 3 sets of underwear, rather than packing a two-week supply.
Note: A travel clothesline comes in handy to help your clothes dry faster if doing light laundry in the bathroom sink. My favorite is this one from Rick Steves Europe.
Comfortable Shoes: One of the most common mistakes people make is to bring a brand-new pair of shoes on their vacation. After all, we all want to look our best, don’t we? However, since you’ll be doing a fair amount of walking or standing on your vacation and/or tour, you should bring a pair of shoes that are comfortable and well broken-in.