YETI kids need a bottle that can keep up. Introducing Rambler Jr., a small and mighty bottle over engineered for your little wild ones. This 12 oz. powerhouse inherited double wall vacuum insulation from its Rambler predecessors, carrying on the family legacy by locking in ice cold hydration through backyard campouts and breaks between tag. Plus, it's engineered with a super strong, stainless steel armor that won't flinch through bumps and drops on account of slippery hands.