The Go GaGa Urban Sherpa Strap helps to ease the load of a heavy bag. It distributes the weight more evenly than a traditional messenger bag. As you can see from the photo below, the strap stretches over your shoulder. As the mother of two young children, I always have a thousand things in my bag. I don't use two separate bags for a purse and diaper bag, I just put it all in one big, very heavy bag. The Urban Sherpa strap makes it much more comfortable to carry.