Thank you Jack Horn! Indeed there's no way to know where our things may go but usually, they get back to us. The traditional strap on luggage tags can easily get tugged off, fall off or something - despite buying really great ones!
I'd never thought about putting in an itinerary in my suitcase but Host Young Gang Mom brings up another great idea to ensure one's address is indeed "in the bag" and it'll get home if it gets detoured.
There is another thing I do when packing for flight and that is to use packing tape to seal all bottles (shampoo, lotion, body wash - any liquid item, even if it's in a ziploc) so that it's less likely I get the bags and anything DID open. Taping tops shut gives me added peace of mind, especially if it's a long trip and due to the regulations about bringing larger bottles of liquids on the plane.
I'm sure we have it here listed in our website resources, but when traveling internationally, it's always important to make copies of all passports and plane/train tickets so that if anything is lost or stolen, they are easier to replace when there are copies but keep these copies in the carry-on bag when flying, and keep them separate from your actual passports/tickets once travel is underway - if there is a safe in the hotel room or hotel, place them there.
Lastly, bring a disposable digital camera with you for when you wish to be all together in the same photo. The quality is still good and there's no worrying about cameras....even if you feel comfortable with whom you might hand your camera too, it's happened often that I get terrible photos from asking people to take pics with our camera because they may not use it correctly.
Happy Summer Travels to all!