The YETI Rambler Junior 12 oz. Bottle is just the right size and keeps kids hydrated easily. The double-wall vacuum insulation keeps their beverage hot or cold for all day use, while the 18/8 kitchen-grade stainless steel construction wont rust or dent for lasting durability. The Rambler Bottle Straw Cap has a flip-open valve with a straw for easy drinking and is 100% leakproof for no spills.