This is one of those gadgets that you would go "Why didnt I think of that?" when you see it. It is simple. Easy to use. And can definitly be quite useful. I am talking about the Add-A-Bag luggage strap. This little strap lets you attach a carry-on bag to your main wheeled bag so you can easily carry both. Just loop it through the handles on top of both bags, buckle it, and you're ready to roll. No more looking back wondering if the other bag is still there or making sure its not on a side and getting under the wheels. It also keeps it close to the larger bag for easier maneuvering. The strap is convenients since when not using it, you can easily fold it and store in one of the bag compartments and always have it with you.