The lid and straw are dishwasher safe on top rack. The pictures on the cup itself wear off with each run of the dishwasher so I would recommend hand washing only. We have four young kids and these go everywhere with us (car, park, zoo, museums...). If the lids are tight it's hard to drink water out of them, but if you loosen the lid they leak. Our oldest is 5.5 and he does better so these are probably good for older kiddos.

I’ve received the Zak Designs 12-oz. Stainless Steel Double-Wall Tumbler for Kids with Antimicrobial Straw, 2-Piece Set two weeks ago. I couldn’t be more happy with the product. It’s winter, it’s come at perfect time. I recommend this product to all my friends and family.

I got these for my 4 year old and thought he might be a little too old for them, but have found them to be the perfect water bottle to use around the house because they are spill proof. He loves the straw and it has a mechanism that prevents it from leaking if it tips over. The Spidey and Amazing Friends theme was the perfect choice and this is now his go to choice of cup. He can even easily screw on the lid by himself.

I had ordered these for my grandchildren age 2 & 8. At first I thought they might not like them, but they both loved them. They easily fit in the car's cupholder and the straw make it very easy for them to drink. They loved the Star Wars design and I love that they don't spill. Great product.

My child absolutely loves these cups! I constantly have an emotional support cup of ice water with me everywhere I go and now my child can have one too. They keep their drink, icy, cold, and refreshing in the summer heat.. With it being spill resistant, and also kid friendly, you cannot beat it.

This Zak Minnie Mouse spill-proof water bottle is an absolute winner! We got it for our 4 and 6 year olds and it has quickly become their favorite. First off, the Minnie Mouse design is just adorable. The bright colors and cute details are a huge hit and make drinking water fun. More importantly, it truly lives up to its "spill-proof" claim! We've had our fair share of leaky sippy cups and water bottles, but this one has been fantastic. Even with enthusiastic tipping and shaking, we haven't had any major spills. This is a lifesaver for car rides and outings. The size is perfect for little hands to hold, and the flip-top straw is easy for them to use independently. It also seems very durable and has held up well to being dropped (which, let's be honest, is inevitable with kids!). Cleaning is also a breeze. The straw and lid are easy to disassemble and wash thoroughly. As a parent, convenience is key, and this water bottle delivers. If you have a little Minnie fan and are tired of messy spills, I highly recommend the Zak Minnie Mouse spill-proof water bottle. It's cute, functional, and a great value. Five stars all the way!

My son uses different "spill-proof cups", but many still leak or spills if he accidentally knocks them over. However, this Zak 12 oz. Tumbler has proven to be a true Leak-Proof Cup. I chose this particular cup because I really loved the cute design & bright colors, but I also wanted a insulated cup that could keep his drinks cold no matter the season. This cup does a wonderful job at that! My son really likes the straw top and it's easy for him to drink from. I haven't had any issues with the cup leaking and it's very simple to clean and fill with liquids. Out of all the cups we've tried, this has definitely been a favorite and I plan on getting a more.

My grandson loves these cups. He just turned four. I have not had any leakage when dropped, and it keeps the cold drinks cold. He sucks them like a straw. I hand wash, and use a bottle brush to clean the straw part. It says the top part is dishwasher safe, but I clean the detached straw, and straw opening on the lid with a bottle brush. You could use the dishwasher for sanitizing.

Just got these and am happy with them. They are sturdy and spill proof too. I like that the straw and mouthpiece both can be removed for easy cleaning. The pictures on the cups feel like they won’t come off after a few washes. The lids love Star Wars so they are excited to use them.

I have been using these cups for some time now since a lot of reviews said they were leak proof. They were: at least for the first couple of uses. Then the contents would start oozing back out through the straw after a couple of uses. Fist I thought I had just fallen on a faulty product. Bought another set and same thing happened. And then the straws stain after some time and the plastic part stops fitting right. Overall nice cups just don’t let sit with fluid on a surface for too long.