Assuming you’re not traveling alone, spread your items among several suitcases.
Rather than put the kids’ stuff all in one suitcase, parents’ in another, general items in yet another, etc., pack each suitcase with at least one outfit for every member of your family.
That way, if any of your luggage is lost, you all still have some essentials, which can hopefully tide you over until the missing bags are located.
I always toss a couple plastic zipper bags in my suitcase and carry-on.
They come in handy for everything — from wet bathing suits after a hotel swim, to a dirty diaper on the airplane. They also keep souvenirs dry and unscratched, and come in handy for muddy shoes or liquid gifts (like maple syrup or olive oil) that might otherwise ruin clothing in a suitcase if the glass breaks.
Don’t be sad if you can’t find a zippered bag: any plastic bag will work. In fact, larger bags are great for containing muddy shoes, or can be used as an impromptu “day bag” in a pinch.
While utilizing packing space wisely is always a good tip, there’s another tip that travelers often overlook: rather than overfilling suitcases and carry-on luggage, leave some extra space.
Many times during travel, people buy souvenirs — from clothing to art. Leaving a little extra room can save the hassle of having to cram items into bags — or having to locate additional luggage for these items.
A practical travel kit should include: