Rambler® Jr. is a small-and-mighty kids' bottle over-engineered for your little wild ones. This 355 ml powerhouse inherited double-wall vacuum insulation from its Rambler® Drinkware predecessors, carrying on the family legacy by locking in ice-cold water for backyard campouts and breaks between tag. We made sure its included straw cap is leakproof when closed and both the bottle and cap are dishwasher safe. Plus, it's engineered with a super strong, stainless-steel armor that can handle taking a tumble. Note: For ages 3+. Do not use the Rambler Bottle Straw Cap with hot, carbonated, or pulpy beverages or for storage of food or perishables. Learn more about product use and safety on our Rambler FAQ page. Rambler Bottle Straw Cap is leakproof when closed, but is not packable as the straw cap can open if pack is shaken or jostled. Details Leakproof When Closed: To avoid cleaning up big spills. 18/8 Stainless Steel: Made with kitchen-grade stainless steel, so they're puncture and rust-resistant. Double-wall Vacuum Insulation: Keeps cold drinks cold. Dishwasher Safe: Because no one needs more work to do.