Re. dry shampoo: I have fine, naturally curly hair, but use try shampoo on 2 day after straightening my hair. I like Oscar Blandi, but use other brands, too, including Ojan. Unlike other posters, I like both aerosol & non-aerosol versions. However, I find that dry shampoos are more effective if I do a quick blast with the hair dryer 5-20 minutes after the dry shampoos have been applied. FYI, if you're not a blond, there are a couple brands, including Aveda & HairFix, that sell colored dry shampoos. (I'm dark haired and find that using the hair dryer keeps me from having to use tinted dry shampoos.)

Speaking of curly hair: Don't try to fight the weather. I was in Tokyo (70s and drizzly) and Hong Kong (80s and wet/humid) in late May-early June. I could straighten my hair in Tokyo, but in HK my only option was curly. Check the weather before you travel and just go with the flow.

Ponds Clean Sweep cleansing & make-up removing towels: Great for cleansing/makeup removal on the go...I originally bought these to use on overnight plane trips (quick sweep of the face, rinse with water (optional), then moisturize), but now use them or Olay dry towelettes for washing my face on the road. It's one less item that has to go in my ziplock bag!

If you travel internationally a lot... see if your favorite hair dryer/curling iron/straight iron is available in the "other" voltage. I'm in the US and love my hair dryer and flat iron. I've invested in the 220v version of both and am thrilled to have done it. My hair dryer is a Conair, and I was able to order the same hair dryer off of Amazon.co.uk and have it shipped to my hotel a couple years ago. My flat iron comes from a smaller manufacturer (Artizen) and I called them directly to purchase the 220v version of my flat iron.