This thing is built for mountain biking but the features are actually perfect for the jungle. Check out the video on REI too, very useful. CamelBak H.A.W.G. NV Hydration Pack - 100 fl. oz. - Free Shipping at REI.com
Kid's hydration pack. This is the perfect size for toddlers and preschoolers! It holds enough water for an outing and has enough storage for them to bring one small special item from home while leaving enough space to collect keepsakes on the trail.