This 12 oz. powerhouse inherited double-wall vacuum insulation from its Rambler predecessors| carrying on the family legacy by locking in ice-cold water through backyard campouts and breaks between tag. As a well-deserved convenience for you| we made sure its Straw Cap (which comes included by the way) is leak resistant when closed and both the bottle and cap are dishwasher safe. Plus| it’s engineered with a super-strong| stainless steel armour that won’t flinch through bumps and drops on account of slippery hands.