CamelBak Mini M.U.L.E.

A great hydration pack for children. We own two, one for our 7 year old and one for our 3 year old. They fit well and neither of them complain about having to carry it. I no longer worry about them becoming dehydrated on a hike. There is also enough room to carry a whistle, a space blanket and some small snacks. The only problem I have had is that my kids have had the tendency to chew on the bite valves and replacing them is a tad expensive.

With its small bladder, my son was able to be "just like daddy" and pack his own water.

For the kid's ego, this is great.

You can even fit a light lunch inside (kid's size, of course).