Zak Designs Kelso Tumbler Toddler Cup For Travel or At Home, 12oz Vacuum Insulated Stainless Steel Sippy Cup With Leak-Proof…
Zak Designs · 1 more pick →
Best for
Best stainless steel / insulated
Amazon rating
Amazon aggregate, one input among many in the Verdict Score
Based on 1 trusted source
Current price
$10.44
Updated Jun 27, 2026 · 1 min read
Sources behind this verdict
7 reviewers weighted by source trust
The consensus
What reviewers found
Synthesized across the trust-weighted source mix below.
Across the reviewers we read, the insulated stainless version of the Zak Kelso carries the same leak-proof reputation as its plastic sibling with the added benefit of temperature retention. High-trust r/toddlers commenters report putting it through the dishwasher 'with no issues,' and one names it alongside other top picks as 'great for every day use.' Verified-purchase reviewers on Walmart and Target (0.92 rating) repeatedly highlight that the 18/8 stainless steel and vacuum insulation keep drinks cold for hours, which the listing claims is up to 10 hours. Low-plastic-focused communities like r/moderatelygranolamoms specifically gravitate to the stainless build—several note they send stainless to daycare since glass isn't allowed—making this the pick for parents avoiding plastic.
What reviewers liked
- High-trust community reports of leak resistance and dishwasher durability
- Vacuum-insulated stainless keeps drinks cold for hours per verified reviewers
- Preferred by low-plastic-focused communities for daycare and travel
- No exposed soft spout to chew through
Where it falls short
- Heavier than plastic cups once filled, per reviewers
- Straw-based design isn't suited to first-time bottle transition
- Smaller review base than the plastic Kelso version
- Replacement straws/gaskets needed over time
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Across the reviewers we read, the insulated stainless version of the Zak Kelso carries the same leak-proof reputation as its plastic sibling with the added benefit of temperature retention. High-trust r/toddlers commenters report putting it through the dishwasher 'with no issues,' and one names it alongside other top picks as 'great for every day use.' Verified-purchase reviewers on Walmart and Target (0.92 rating) repeatedly highlight that the 18/8 stainless steel and vacuum insulation keep drinks cold for hours, which the listing claims is up to 10 hours.
Low-plastic-focused communities like r/moderatelygranolamoms specifically gravitate to the stainless build—several note they send stainless to daycare since glass isn't allowed—making this the pick for parents avoiding plastic. The trade-offs reviewers mention are weight (heavier than plastic once filled) and a higher price per cup than the basic plastic tumblers. It also shares the straw-cup caveat: it's a graduated cup, not a first transition cup.
- Size And Material
- The drinking tumbler has a 12-ounce capacity and measures 3.2 inches in diameter and 6.77 inches tall. It's made of food-grade, 18/8 stainless steel with a silicone spout. Top rack dishwasher safe and can be disassembled for cleaning. Everything is BPA free and should not be microwaved.
- Vacuum Insulated
- The water tumbler has vacuum insulation to keep drinks cold for up to 10 hours. The double-wall construction also prevents condensation from forming on the outside, eliminating messy water rings.
- Leak-Proof Design
- The silicone straw spout has a built-in valve that allows liquid to flow when drinking and prevents accidental spills when the tumbler is tipped over. The straw is also soft and comfortable for kids to drink from.
- At Home Or On The Go
- The straw tumbler is suited for travel, since it won't leak and fits in car cup holders while keeping drinks easily accessible. It's also great for drinking beverages at home without worrying about stains or nearby electronics.
- Lifestyle
- Zak Designs drinkware makes hydration fun! This cute tumbler is a great gift for any young fan or kids just graduating from sippy cups. The tumbler is fully reusable--no more disposable cups--and a fun addition to the daily routine.
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We love the Zak cups! We put ours through the dishwasher and have had no issues. My toddler doesn't really throw cups so can't speak to how it ...
We use both the glass and stainless steel (can't send glass to daycare). We like them! We haven't had issues with leaking, and they're sturdy.
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