Zak Designs Kelso Toddler Cups For Travel or At Home, 15oz 2-Pack Durable Plastic Sippy Cups With Leak-Proof Design is Perfect…
Zak Designs
Best for
Best leak-proof for bag
Amazon rating
Amazon aggregate, one input among many in the Verdict Score
Based on 1 trusted source
Current price
$20.99
Updated May 15, 2026 · 1 min read
Sources behind this verdict
10 reviewers weighted by source trust
The consensus
What reviewers found
Synthesized across the trust-weighted source mix below.
Across the reviewers we read, the Zak Designs Kelso tumblers earned the most consistent durability endorsements in the category. A high-trust r/toddlers thread described having used them for two years with dishwasher cycles intact and designs still readable, and Zak also sells replacement parts at reasonable prices, a detail multiple verified-purchase reviewers on Amazon and Walmart called out. Another high-trust r/toddlers commenter reported daily drops 5+ times with no failures, attributing the only leak incidents to a rubber gasket not being seated correctly.
What reviewers liked
- Multiple high-trust r/toddlers threads report multi-year durability with intact dishwasher-safe designs
- Verified-purchase reviewers consistently report no leaks when the gasket is seated correctly
- Replacement parts available from Zak at reasonable prices, extending product life
- Textured exterior helps small hands grip; 15 oz capacity is generous for outings
Where it falls short
- Plastic construction provides no insulation, drinks warm quickly
- Leaks reported when the silicone gasket is not fully seated, a common assembly error
- Straws can be bitten through by toddlers who chew, per verified-purchase reviewers
- Larger 15 oz size can feel oversized for younger toddlers just transitioning
Across the reviewers we read, the Zak Designs Kelso tumblers earned the most consistent durability endorsements in the category. A high-trust r/toddlers thread described having used them for two years with dishwasher cycles intact and designs still readable, and Zak also sells replacement parts at reasonable prices, a detail multiple verified-purchase reviewers on Amazon and Walmart called out. Another high-trust r/toddlers commenter reported daily drops 5+ times with no failures, attributing the only leak incidents to a rubber gasket not being seated correctly.
The consensus across r/moderatelygranolamoms and r/BabyLedWeaning is that the textured exterior helps small hands grip, and the 15-ounce capacity outlasts smaller toddler cups for outings. The silicone straw with built-in valve is the load-bearing feature for the leak-proof claim. Reviewers who treat sippy cups as effectively semi-disposable will find the plastic body and replaceable straw a strong value proposition relative to insulated stainless options.
- Size
- The set contains two Zak tumblers that are 3.16 inches in diameter and 6.67 inches tall. They have a capacity of 15 ounces.
- Material
- The durable tumblers are made of plastic with silicone straws. They're dishwasher safe, can be disassembled for easy cleaning, and should not be microwaved.
- Leak-Proof Design
- The silicone straw 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! These tumblers are a great gift for kids just graduating from sippy cups. The tumblers are fully reusable--no more disposable cups--and a fun addition to the daily routine.
I've had these for 2 years and they're going STRONG. Dishwasher safe, designs are still intact. Zak sells replacement parts for very reasonable ...
While they are plastic, they're so much easier to hold because they're smaller and have a texturized exterior (though my daughter often picks it ...
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“Zak Designs Kelso Toddler Cups Review: Worth the Hype for Leak ...” · YouTube
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