Compare Kids Water Bottles
Which scores higher on safety? R3 breaks it down.
R3 scored the Thinkbaby Thinkster 9oz Stainless Steel Straw Bottle 8.4/10 and the Klean Kanteen Kid 12oz Stainless Steel Sport Bottle (Sport Cap 3.0) 8.4/10 on the same kids water bottles scoring system, weighing safety, efficacy, and usability. The overall scores are close; the pillar breakdown below shows where they differ.
The most important dimensions, side by side.
See which one actually scores higher — and why
Free account unlocks full safety scores, spec-by-spec breakdown, and the R3 verdict on Thinkbaby Thinkster 9oz Stainless Steel Straw Bottle vs Klean Kanteen Kid 12oz Stainless Steel Sport Bottle (Sport Cap 3.0).
Unlock the full Thinkbaby Thinkster 9oz Stainless Steel Straw Bottle vs Klean Kanteen Kid 12oz Stainless Steel Sport Bottle (Sport Cap 3.0) breakdown
Free account unlocks all safety scores, complete spec comparison, scoring rationale, and the R3 verdict on which one to buy.
Everything you need to make the call - who each one is for, and who should skip it.
Go for it if you...
You want your child's water touching only bare stainless steel, with no plastic lining inside the bottle
Your child is a toddler or older and past the stage of biting and pulling at small parts
You want a bottle that comes fully apart and goes in the dishwasher for easy daily cleaning
You want clean food-contact materials at one of the lowest prices in the category
You want your child's water touching only bare stainless steel, with no plastic or coating inside the bottle
Your child is school-age and past the stage of chewing or pulling at small parts
You want a bottle that comes fully apart and goes in the dishwasher for easy daily cleaning
A leak-resistant flip spout for a backpack matters more to you than keeping drinks cold
The main thing to know
The silicone straw pulls out and is meant to be replaced over time, so this is a better fit for a child past the stage of chewing and tugging at small lid parts than for a baby.
The soft spout and stainless straw both detach, so this is a better fit for a school-age child than for a baby or toddler who chews on lid parts.
Skip this if you...
Your child is a young baby who tends to bite and tug at removable straws
You need a full school day of water without refilling, since 9 ounces is small
You want a protective base boot, because this bare bottle will dent and rattle on hard floors
Your child is a baby or toddler who tends to bite and tug at removable spouts and straws
You need drinks to stay cold, since this single-wall bottle is not insulated
You want a protective base boot, because this bare bottle will dent and rattle on hard floors
Neither of these quite what you're looking for?
I've reviewed all Kids Water Bottles options at every price pointEvery Kids Water Bottles in our database is scored using R3's deterministic scoring system - the same inputs always produce the same score. For this comparison, we evaluated Thinkbaby (Thinksport) and Klean Kanteen across 3 independent criteria: Safety (96%), Efficacy (1%), Usability (3%). No sponsored rankings. No paid placements.
Straight answers - no sponsored content, no filler.
Both scored close to 8.4/10, so the better choice depends on your priorities. Safety is our top-weighted scoring pillar, followed by efficacy, and usability. Check which pillar matters most to your family and compare those specific scores.
R3 uses a deterministic scoring system - the same inputs always produce the same score. We evaluate each Kids Water Bottles across Safety, Efficacy, Usability using independently verified data. No sponsored rankings. No paid placements. Every score is fully reproducible.
Not necessarily. The overall score reflects how we weight those three pillars, but your priorities may differ. If you care most about safety, compare the safety scores directly. If budget drives your decision, the prices tell a clearer story. The "right" pick is the one that matches what matters most to your family.
Not the right match? Explore these alternatives in the same category.
Pura
Pura Kiki 11oz Stainless Steel Straw Bottle
8.8
Owala
Owala Kids FreeSip 16oz Insulated Stainless Steel Water Bottle
5.9
Klean Kanteen
Klean Kanteen Kid 12oz Stainless Steel Sport Bottle (Sport Cap 3.0)
8.4
Lifefactory
Lifefactory 12oz Glass Water Bottle with Active Flip Cap
8.6
