The story behind the Tag*a*long is a simple one. A mom and dad needed a way to push their little one in a stroller, and have a method behind keeping their older little one from running off, etc. How often have you tried holding the hand of one while pushing the other? I'm thinking it's not as simple of a task in practice as it is mentioning it.
Heck, it's not even that easy to think about. So, these parent developed a Tag*a*long system that basically loops to your stroller, and your older one can hold onto that instead. It's one of those simple but brilliant device that you wish you would have thought of.
They come in four bright colors, so they are easy to find. They retail on their site for about $9.99 (which you can see here http://www.tagalongkids.com/ ) but you can win them from Fabulous Family Reviews and Giveaways by entering.