Price: ~~$13.99~~ - $12.99
(as of Oct 08, 2026 00:41:17 UTC – Details)

Product description

Does the Kelso prevent spills when the tumbler is tipped over?

Yes, and you don’t need to remember to close the lid! The Kelso tumbler has a valve in the spout, which lets water flow freely when kids are drinking, but stops spills if the tumbler is tipped over.

Is the tumbler easy to clean?

Yes, both the spout on top of the lid and the inner straw underneath the lid are removable to make cleaning easy, and the parts are all dishwasher safe.

How old should my child be to use the Kelso tumbler?

We recommend this tumbler for kids age 3 and up.

What kind of drinks can go in the Kelso tumbler?

The Kelso tumbler is perfect for everyday cold beverages like water, milk, or juice. Thick smoothies are a little more difficult to drink with the valve, while carbonated drinks can build pressure and push liquid up through the straw.

Can I travel with the Kelso?

The Kelso tumbler fits in most car and stroller cup holders for on the go convenience. We don’t recommend putting the Kelso tumbler in a bag, as pressing on the soft spout can open the valve and allow drinks to flow out.

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Customer Reviews

4.5 out of 5 stars 4,040

Price

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Size/Capacity

12 oz

Thermal Insulation

✔

Leak-Proof and Travel-Ready

✔

BPA Free

✔

Material

Stainless steel

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, while the tumbler should be washed by hand. 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 one or kids just graduating from sippy cups. The tumbler is fully reusable–no more disposable cups–and a fun addition to the daily routine.
Customers love this toddler cup for its leak-proof design, perfect size, and temperature retention, with one customer noting it holds cold liquid for a long time. The cup is easy to clean, coming apart for thorough washing, and customers find it worth the money. However, durability is a concern as the design peels off after less than a month of use, and drinkability receives mixed feedback, with some finding it easy to drink from while others struggle with the straw.

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Zak Designs Zaksaurus Kelso 12oz Stainless Steel Leak-Proof Toddler Cup