Zak Designs Shells Kelso Tumbler Set, Leak-Proof Screw-On Lid with Straw, Bundle for Kids Includes Plastic and Stainless Steel Cups with Bonus Sipper (3pc Set, Non-BPA) 15 fl.oz.

I bought the Zak Designs Dino Camo Kelso Tumbler 3pc Set for my two grandkids, and they love it! The fun dino design is a hit, and I love how practical it is—leak-proof lids, durable plastic and stainless steel, and the straws are perfect for little ones. Easy to clean and great for travel or home. A great combo of fun and functionality. Highly recommend for kids on the go

My son absolutely loves these cups! We mainly use them for milk, and they’ve been completely leak-proof—no drips at all. He’s super active and has dropped (and even thrown!) these cups multiple times, and they still work perfectly. They’re incredibly durable and easy to clean. The Blippi design is a huge bonus—my son gets so excited every time he uses them. Highly recommend for any parent looking for a reliable, toddler-proof cup with a fun design!

These are adorable and super durable. No leaks, easy for little hands, and dishwasher safe. Win-win!

These are great for toddlers. They do not leak if tippoed over. If star liquid is cold, it will push up and leak very slightly from the straw top. I’ve found all cups do this so it’s not a deal breaker. I love that this comes with an insulated and non insulated option. The colors are vibrant and they have held up well with a wild toddler. I love that it comes with extra spout and straw.

They do not leak even after being thrown to the floor from a high chair. The Blippi design started flaking off after the second wash and has slowly flaked off since. I have mostly hand washed them, but had no problem with being put in the dishwasher once. I was worried they would warp somehow, but they did not. Opened on Christmas 2024 and the picture is how it looks now (July 2025). We bought a different Blippi set from this brand, but the design is mostly gone now. So if you are buying for the purpose of the Blippi design go with this one.

I loved our sons Contigo cup but after the lids shrunk from sterilizing them and then they started leaking, I decided to try these after they were recommended to me. I didn’t want to commit to 2 cups so my friend told me about this set where you get one plastic and one stainless steel. Haven’t used the stainless steel cup yet since my son is very much in the throwing phase but the plastic cup does the job. It’s very easy to use but I can imagine if it was the first straw cup your child was using that it could be a little difficult to drink out of. My son has thrown it multiple times off his high chair and minor scratches or nicks but I have noticed that sometimes after throwing it that the inside straw will disassemble from the outer straw. Easy fix though to just readjust it. It’s not fully leak proof although it was more so in the beginning than now. My son is in this phase where he will put the bottle upside down and smush the straw to the tray/table and water will leak out. He also throws it off the high chair even when attached to a bungee cord but when it’s upside down will also drip out. I do agree with other reviews where the design does wear off. We’ve been using this cup for a month and the design is already wearing off so be careful which design you choose since it might be more noticeable on certain ones. I still think it’s a good cup, easy to clean, and a good value for 2 cups especially one being stainless steel.

I love the design of the bottles and how there’s two of them for different functions. The thermal cup is great for maintaining the milk from warming up. The other bottle is great for water and juice( at least for my preference of use). It’s a great size for my toddler as well, it brings an extra straw and it’s a great transition from the bottle to sippy cup. It can be a bit leaky if you shake too hard but not enough where you’ll freak out. Overall happy with this purchase.

I was in the market for some toddler cups since my little one needs to transition away from bottles. I bought a couple different types but these Zak cups are BY FAR my favorite! They were highly recommended by a lot of parents and specialists on TikTok.The price is fair for the quality of the materials. I got the set with a steel tumbler and a plastic cup so I could compare (and avoid plastic when possible). They are both high quality, super easy to wash, are dishwasher safe, and the designs are exactly as pictured.My daughter does really well with these, and the straw top is a soft silicone so she gets to teethe on it too. I usually don't add the plastic straw because my kiddo likes to tip the cup back like it's a bottle. These cups are pretty leak-proof! She can spill an occasional drop or two here and there but it's no different than how much she would spill with her bottle.The only thing that I can call a con is the fact that these don't have handles, which I think would make it easier for my kiddo to hold, but she manages fine without them for the most part. Also, the steel tumblers are heavy and could do some damage if dropped on a foot or flung into a wall (she's in a throwing stage) so we only use them with close supervision.If you are looking for a cup to transition your baby away from bottles, I would definitely recommend these! So far, these are my daughters (and my) favorite cup. I have already bought 2 more sets.Hope this helps!