If your youngsters are old enough to ride trails, then they'll need their own hydration. And because many kids' bikes are too small to affix a water bottle mount, the Evoc Joyride Hydration Backpack - Kids' is the perfect solution. Like its older and bigger siblings, the Joyride was constructed from 210 denier ripstop nylon that was polyurethane-coated for water resistance and durability. The pack holds just over 224 cubic inches and features a main compartment as well as a smaller, fleece-lined pocket. Adjustable Air Mesh shoulder straps and waistband keep the pack securely fastened. It holds a two-liter hydration bladder. The Joyride Hydration Backpack - Kids' is available in two colors: Olive/red and Sulphur/neon blue. It comes in one size and is suitable for most children from ages 7 to 12.