Trip to Europe October 3 weeks

Some countries requires that your passport has at least 6 months validity left.

Reconfirm your flights as there may be airline schedule changes. Your return flight must be reconfirmed at your destination directly with the airline 3 days prior to your departure.

Make sure that your luggage has a tag with your name, address, and telephone number. Tie a colorful ribbon or attach distinctive stickers to your luggage so that you can identify it easily, and other travelers will not take it by mistake at a busy terminal.

A pile of newspapers or a stuffed mailbox tells thieves that you are not at home.

Many countries demand that you have such a certificate when you enter their borders.

Remember to keep a close eye on the passport copy - it's a great asset if you lose the original, but can also be used to steal your identity if it gets into the wrong hands.
If you have a web based e-mail platform, e-mailing yourself scans/copies of important documents and passport info is a great alternative to hard-copies. It's easier to access, less likely to be stolen, and guaranteed to always be on hand.

Use ziplock plastic bags for any items that could leak or possibly break in transit.

Easily stolen, so don't bring anything too valuable.

Ditch the bulky bath towel. There's only one way to go when traveling - microfiber travel towels. They dry quickly, are soft, incredibly absorbent, and roll up to take virtually no space.

Must be pretty sturdy. Glass may not be a good idea for some journeys.

Also handy for pulling out splinters

For international travel: consider unlocking your cell phone SIM card so you can use your phone there (purchase a local SIM in your destination).

Ask your doctor to provide you with a letter for any prescription medications that you are taking with you. Keep medicine in original containers, if possible.