Fits Classic narrow mouth bottles only.
(with internal threads)
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The 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 so you can stay hydrated your way. Includes special telescoping straw to fit various size bottles. NOTE: Compatible with Classic narrow mouth bottles only (with internal threads). Recommended for kids ages 3+.
| Weight | 3.4 ounces (96 g) |
| Size | 5.3" H x 3.5" W (134.6 mm H x 88 mm W) |
| Leakproof | Yes |
| Note | Not for use with hot beverages |
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.
Overall rating: 4.213333 / 5 from 75 reviews.
The Classic Flip Seal Sport Cap is highly regarded for its leakproof design and ergonomic spout, offering convenience and versatility for hydration on the go. Customers appreciate the quality and functionality of the cap, though some noted difficulty in use. The telescoping straw fits various bottle sizes, making it suitable for kids ages 3 and up.
Review topics: [quality, design, water, works, improvement, upgrade, size, use, straw, cap, bottle, lid, seal, kids, leaks, klean kanteen, caps, fits, spills].
"I love that I can use this cap on other bottles that don't have the metal straw but the adjustable straw sometimes slips out of the desired length and therefore needs re-adjustment. It would be ideal if there's a locking mechanism built in to the chosen spot/length. It would also be nice if there is a choice of color aside from black so that it would better compliment the other colored bottles."
"I really enjoy these caps. The straw with flip spout makes trail water breaks quick and easy! No fooling with the cap. No cranking your neck. No spills. Got 4 for all of my bottles. I learned not to put the bottles in my pack. Gear can press on the flip knob. That allows water to leak out of the vent hole."
"I like it and the cap doesn’t leak, I wish the straw had the lip like the kids straws that keeps it in place. It sometimes separates from the top when I’m filling my water bottle then I have to fish out the straw from the bottle. I’m a nurse and even though I wash and wash my hands I’d rather not stick my finger in my water bottle if I can help it! It also sometimes has such a strong seal that it creates a vacuum and I can’t drink water until I loosen the cap some."
"I had to replace all my son’s flip caps because the old ones ripped because the straws were not fitting. This is much better and I love the telescope straw. Sometimes the straw falls out of the cap, but at least they don’t tear the rubber."
"Functional and easy to clean ! Keeps your water clean too by being able to securely close the lid. Excellent quality."
"The new lid is great. Easy to use and I love the that the straw is metal and not plastic."
"Nice"
"I got one of these to upgrade one of my older water bottles. At first, I wasn't sure about it. It took a little experimentation to figure out how to drink from it smoothly (the trick, I find, is to seal your mouth over the very end and angle upward toward the front and top of your mouth). Now I like it a lot. It's especially useful to drink from while driving, so I don't have to tilt my head back while the car's in motion."
"The flip cap gets a 5/5, the collapsible straw gets a 1/5. In an attempt to create a cheaper, one-size-fits-all straw, Klean have come up with a master of none. It’s thinner and more fragile than its one-piece conterparts. Curious how long until the telescoping pieces lose their staying power."
"It’s a great lid/straw! A little hard to open, not the easiest to clean…but we’re very happy for sure!"
