There may be a screaming infant on your flight. There may be an all-night disco in your hotel. The maid may vacuum the room upstairs at 7am. Your suburban ears may not let you sleep with city noise. Large box of tissues .
Most hotels overseas provide only a small packet of tissues if they provide any at all.
Keep a fistful of tissues in your day pack to also use as toilet tissue when necessary. Take a small stash of trail mix, dried fruit or nuts in case you get hungry on a tour, in the night or when the restaurants are closed. If they get lost or stolen, you will know exactly what you're missing and have the numbers handy. Candy to share . Take along some individually wrapped candies - not chocolate if you're going someplace warm.