Klean Kanteen
Single-wall stainless steel kids’ bottle with a sippy spout — the liquid sits in steel, and the bottle grows with the child as the cap is swapped.
$$$Our price tier
green sprouts
Sprout Ware Sip & Straw Stainless Steel Cup
Plasticproof Great $$$Our price tier
Stainless steel cup with a sip lid and a straw lid, where the liquid touches only steel and silicone — two stages of drinking in one cup.
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See exactly how we verify this
Steel and silicone onlyNo plastic in the drink path.
Two lids includedSip, then straw.
No milk smellSteel does not hold it.
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Why it's safe for your family
- The cup body is stainless steel, so the drink is not held in plastic between meals or in a warm bag.
- Both lids use silicone for the parts in the mouth, so the transition from sipping to a straw does not introduce a plastic spout.
- Two lids in one purchase covers the stage where a child is between drinking styles, which is exactly when families buy several cups and end up with a cupboard of plastic ones.
- Steel does not retain milk smell, which is the practical failure of plastic cups after a few sour incidents.
Quick specs
Body
Stainless steel
Lids
Sip lid and straw lid included
Mouth parts
Silicone
Care
Dishwasher safe; disassemble to clean
What to avoid instead
Avoid plastic training cups, and avoid any cup whose lid does not come fully apart — the parts you cannot separate are where mold grows. Note that steel cups dent when dropped on hard floors, which is cosmetic rather than a failure.
How we verify — and what we don't
Straight answer: we're a research team, not a testing lab. Here's exactly what our rating is based on — and what it isn't — so you can weigh it honestly.
What we check
- What the product is made of, from the maker's own specs and product listing.
- Whether any part that touches you or your food uses PTFE, PFAS, plastic, or a coating that can degrade.
- Peer-reviewed research on how that material behaves when heated, scratched, washed, or worn.
- Known failure modes — how the product actually breaks down in a real home.
What we don't do
- We have not chemically tested this specific unit in a lab.
- We don't take payment to rate a product higher — there is no sponsored placement.
- We don't show star ratings or "trusted by thousands" counts we can't stand behind.
What gets a product rejected
Anything that adds a known microplastic, PFAS, or off-gassing source — a non-stick coating, a plastic surface against food or skin, vinyl/PVC — is downgraded or cut. We only list what clears that bar.
Don't take our word for it — check the sources yourself green sprouts's product details
Common questions
Sip lid or straw first?
Feeding guidance generally favors moving toward open-cup and straw drinking rather than a long stretch of spouted sipping. Having both lids means you can follow your child rather than buying a second cup.
How do you clean a straw?
With a thin straw brush, every wash. A dishwasher alone does not reliably clear a narrow tube, and this is the single most common hygiene complaint about straw cups of any brand.
Does it keep drinks cold?
Not unless it is the insulated version — a single-wall steel cup takes the temperature of the room. It will sweat with a cold drink inside, which is worth knowing before it goes in a fabric bag.
Related reading
Best Microplastic-Free Sippy Cups
