The Classic 18oz is the original stainless steel water bottle designed for kids and adults with easy hydration in mind. The single wall design is lightweight, small and easy to bring anywhere. The 18oz size features a narrow profile for easier gripping, packing and carrying and the wider than usual 4.4cm opening makes for easier cleaning and plenty of room to drop down ice cubes. PLEASE NOTE: The included Sport Cap is NOT leakproof (but is leak resistant unless its upside down etc). The inside of all Klean Kanteen stainless steel water bottles are electropolished so they don't retain or impart flavour like cheaper stainless steel bottles can. The corners of the bottles are also rounded (a lot more than most others), which means you're less likely to damage it if you happen to drop it.  Benefits for you and your family: New narrow profile with new colors and patterns for easy grip and smaller hands. Updated Sport Cap features removable soft silicone spout for easy cleaning Durable and High Quality Food Grade 18/8 Stainless Steel Construction Wider opening than most at 1.75 inch (44 millimeter) so it's easy to fill, pour and drink from and easy to add ice cubes, fruit etc. The electropolished interior doesn't retain or impart any flavours so whether it's used for milk, water or juice, no flavours are ever retained. Made from safe, durable, high-quality materials with no BPA, phthalates or lead. Easy to clean Dishwasher safe. Bottles with graphic treatments should be hand washed to preserve detail. Lightweight, perfect for hydration and keeps drinks cold in the cooler or in the fridge. Compatible with all Klean Kanteen Classic caps (loop, bamboo, steel, sippy) Lifetime warranty on this premium quality stainless steel drink bottle.  18 fluid ounces (532 ml)Weight 5.7 ounces (161.6 g)Size 9.94" H x 2.56" W (252.5 mm x 65 mm)Opening Diameter 1.75" (44 mm)