Bests & Worsts Reviews from Amazon

It keeps water cold all day and doesn't leak...what more can I say?! When I first got these I filled them up and tested for leaking. When the lid was closed and I laid it on its side there was water in the top when I opened it. I was bummed. Looked like the water was leaking out of the vent for the straw. Then I noticed a little knobby thing (yup that's the technical term) on the lid that clearly was supposed to plug that hole when the lid closed. After checking it out more I realized when i put the straw in, the part you sip on, I didn't get it all the way up. So you push it in from the underside, but after you do that, grab the part you sip on and give it a tug. It will come up through the lid just a little bit more. Then I closed the lid and it hasn't leaked since. I think anyone else with reviews saying it leaks probably hasn't figured this out. And whoever uploaded the video of it leaking, aka pouring out of the straw when the lid isn't closed...ah duh lady. Straws don't seal themselves. Of course tipping it upside down will make the water pour out. Come on. It comes in a ton of different options and my kids love them! Also, they're not that heavy. Some people make it seem like their kid cant lift these, my 2 yr old daughter carries hers all day wherever she goes.