Disney also makes them - and they have clips so you can clip them to your backpack. I always bring a back pack that holds my wallet (I downsize for the parks - just the necessities), camera, phone, couple of disposable ponchos, some cereal bars, hand sanitizers and a zip lock bag to put our phones in on those wet rides, like Splash and Kali, just to be safe. I found some child size, like toddler, backpacks on Amazon for under $10 each. And they are real cute too.