Love the flip seal cap!
"I carry my Klean Kanteen everywhere I go. I love the new flip seal cap. It really does stop leaks, so I can throw the bottle into a backpack. The 18 oz. size works well for me. And I know I’m not drinking plastic!"
18oz Classic with Flip Seal Sport Cap
$3 off accessory with purchase
18oz Classic with Flip Seal Sport Cap
Sale price$ 19.95
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18oz Classic with Flip Seal Sport Cap
Sale price$ 19.95
NOTE: Bottle is NOT insulated.
The 18oz Classic water bottle is a stainless steel bottle designed for kids and adults, with quick hydration in mind. Single-wall, non-insulated design is lightweight, small, and easy to bring anywhere. Made with certified 90% post-consumer recycled 18/8 stainless steel, featuring our chip-resistant, durable Klean Coat finish. The 18oz size features a narrow profile for easier gripping, packing and carrying. 100% leakproof Flip Seal Sport Cap comes with an ergonomic spout that opens and closes with just a flick of the thumb and can be used with or without the included stainless steel straw for maximum versatility. Great for running, biking, hiking, fitness and your active lifestyle.
- 100% leakproof Flip Seal Sport Cap with removable stainless steel straw
- Lightweight
- Cupholder friendly
- Dishwasher safe
- Certified 90% post-consumer recycled 18/8 stainless steel
- Chip-resistant Klean Coat® finish (all colors)
- Narrow profile
- Won't retain or impart flavors
- BPA-free
- Lead-free
| Capacity | 18 fluid ounces (532 ml) |
| Weight | 7.7 ounces (217.2 g) |
| Size | 8.78" H x 3.28" W (223 mm x 83.3 mm) |
| Opening Diameter | 1.75" (44 mm) |
Child Safety Warning: Cap not intended for children 3 and under. Not intended for chewing or teething. Always use this product with adult supervision. Some adult assembly may be required.
Check out our Care and Use page for videos, maintenance and cleaning tips.
Questions about materials or sustainability? Visit our FAQ page.
Interchangeable Cap Options
Travel Friendly
Overall rating: 4.6843266 / 5 from 453 reviews.
AI Generated Review Summary
The 18oz Classic water bottle is praised for its perfect size, ability to stay fresh and cold, great looks, and durable design. Customers appreciate its lightweight, easy-to-carry nature and chip-resistant finish. The ergonomic Flip Seal Sport Cap adds to its versatility and ease of use.
Summary topics
- Bottle Size: 22%
- Temperature Retention: 3%
- Product Aesthetics: 3%
- Brand Durability: 3%
- Product Design: 5%
Review topics: [size, color, weight, smell, quality, shipping, design, fits, customer service, looks, finish, problem, value, water, plastic, works, recommend, durability, condition, use, craftsmanship, convenience, materials, service, shape, style, daughter, feels, price, solution].
Review highlights
- "The water stays fresh and cold." —
- "Klean Kanteens are well known for their exceptional durability and usefulness." —
- "The 18oz bottle is perfect size for my child, and these slimmer bottles are easier to grab for little hands." —
Reviews
Great size, great quality bottle
"It's a great sized water bottle; can never go wrong with it! Well made and super functional. Not a fan of the flip seal sport cap, but ultimately it works and I can use it fine. Arrived well packaged."
Nice bottle, very portable!
"Very portable bottle that feels nice in the hand. I got a variety of cap options to go with it and they all fit well, though the metal ones are a little noisy taking on and off. Overall good product."
"I love how lightweight it is - perfect for traveling."
Great for school!
"Love this bottle for daily school use. It’s so easy to throw in the dishwasher, straw and all, and have it ready to go each morning. My child loves it and the size is just right."
Great bottle
"Got this for my 4 year old, and it’s perfect. Easy to open, leakproof, easy to clean, perfect size."
Good quality
"This is a great water bottle for every day use, I keep it in my purse. I changed out the sports cap for the bamboo cap."
Exactly as advertised
"Listen to the other reviews, this is a well-made water bottle and my kids love theirs."
Great choice for school kids
"This bottle works great for my 7-year-old, it’s easy for her to sip from, but doesn’t leak in her backpack. Also a fun color. Greta water bottle!"
Perfect sized bottle
"I was looking for a bottle that fits in a cup holder, wasn’t insulated, and didn’t carry an excessive amount of liquid. This bottle did just that. It’s easy to carry and clip onto my work bag without the added weight of an insulated bottle or that of a 40 ounce. The sport cap is easy to open and drink out of and the bottle is super easy to clean."
Q&A
- Will this fit in a typical bike water bottle holder?
- yes, both our 18oz and 27oz Classic bottles fit in most bike cages, depending on the exact size or method of mounting on the bike frame.
- Does the 18oz classic come with a lid or is the lid sold separately ?
- Hi, the 18oz Classic comes with a Sport Cap, as seen here: https://www.kleankanteen.com/collections/water-bottles/products/classic-water-bottle-18oz
- Hello! I already have one water bottle and a Tumbler, but they're both insulated. I want a single walled one for camping and for heating up water to purify it in case of emergencies since I've heard that double walled insulated bottles break. My question is, can one use these bottles for that? Can they be used to boil water? Thank you.
- Hello, we understand folks have successfully boiled water on camping trips in our single-wall brushed stainless bottles (no coating). Be sure to remove the cap! :)
- My three kids have been using the 18oz for a few years now. However, I recently purchased the blue tint bottle and it’s a lot more narrow and taller than the version we have. Is this the new style? Are they all extra narrow now???
- Yes, this a new design of a bottles. Not all of our bottles are extra narrow, but this one is.
- Is there any plastic used in your Klean Kanteen Classic 18 oz bottle? The part of the lid that screws into the bottle looks like it's made of plastic, but your site doesn't list the materials anywhere.
- Yes, the Sport Cap is BPA-free plastic with a silicone spout. You can see cap details here: https://www.kleankanteen.com/products/sport-cap
- Can you put ice into the "classic" line of klean kaanteens? I seem to recall the pamphlet saying not to, but I can't remember if it was for this bottle or a different one. Thank you!
- Hey Jenny! Yes you can for sure fit ice cubes in the Classic line, they are just non-insulated single-wall, so won't keep drinks quite as cold as long our Insulated Classic or TKWide.
- How to stop sport cap whistle
- Hi there, Please fill out our Warranty Form below with a couple of photos of the Kanteen attached to the form and we would be able to take a further look into this for you! Link : https://www.kleankanteen.com/pages/warranty Have a nice day!
- How long will it keep water cold
- Hi, The Classic 18oz is our original stainless steel water bottle designed for kids and adults with easy hydration in mind. It has one single wall of stainless steel and is only intended to keep water at a neutral temperature.
- Are all products dishwasher safe?
- Hi there, Our single-wall Kanteens in brushed stainless are dishwasher safe, as are our pint cups, baby bottles and single wall food canisters. We recommend handwashing all painted and all vacuum insulated bottles, vacuum insulated tumblers and vacuum-insulated canisters.