Since you don't use a harness at home, why would you need one when traveling? A couple of reasons come to mind.
If your trip involves taking a flight, you'll likely have to arrive at the airport early which may translate into an extended period of waiting before your flight boards. Furthermore, if your child's stroller has been checked with the rest of your luggage, you won't have it with you while you wait. But filling in that time by going for a walk is an excellent opportunity for everyone to get some exercise, especially your little one, and having them on a harness while doing so will keep everyone together.
Traveling is exciting for all family members, including yourself. There is lots to see and do. But you're likely to have a heightened sense of paranoia in a new place and looking around to enjoy the sites while keeping your eyes on your walking toddler may be more stressful than you thought. Having them safely on a harness at your side will allow you to walk with your head up and your eyes a-gander most of the time.
Whether you're at home or away, your child's stroller still morphs into a magnet on wheels for all sorts of stuff that comes from nowhere. Before you know it it's carrying everything BUT your child. But that's fine if you have a harness for them. They can walk and you can continue to shop. When they're tired, they can lay on top of everything to keep it from falling off.
Where you're headed should also be a consideration when thinking about whether or not a harness would come in handy. If you're visiting a major theme park such as Disney almost every child you see will be wearing a harness so you'll blend right in.
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