I purchased and engraved two of these cups through Stanley for both my 12 and 9-year-old daughters to take to school. I also have a two-year-old who loves to grab his siblings cups and play with them. Little did I know the potential dangers hidden within the cup. The bottom piece fell off my 9-year-olds Stanley a couple of weeks ago. I didn’t think anything of it and allowed her to continue carrying it around, bringing it to school, and placing it on her desk everyday to drink out of. I am incensed at the lack of transparency this company has shown. If I hadn’t come across an article stating that there is a potential risk of lead exposure when using these cups, she would have been carrying this poison around with her for months. I will now be taking my 9-year-old to get lead tested and pray that this product did not cause her any harm.

Bought to replace a normal plastic drinking water bottle, as couldn't cope with warm water in summer months. Also wanted a bottle with a straw, rather than drinking from the bottle, as a lot of cheaper alternatives don't have a straw.
Really pleased with it, extremely sturdy, keeps drinks cold for hours. Took it on a hot walking weekend and it was great to have cold water.
It's not leaked on me (others mentioned it has), just have to make sure the lid is fully fitted/screwed on and tightened.
Has a useful sturdy handle for carrying.
It can feel heavy, but not a problem as more importantly I wanted cold water.
It is pricey, luckily I had a JL gift voucher.
Sturdy, will likely get lots of use out of it.

This is a great product! Keeps ice for over a day, water stays cold. Drink spout is easy to deploy and closes securely. The jug can leak if the lid is not tightly closed, but that would be true of any product. I'm looking forward to really using it this summer when the weather heats up. The 40-oz capacity is a good size, too: enough water for a hot day, but not hugely bulky like some products.

All the negative product reviews on this website are odd. In some cases, the review sounds like it is for an entirely different product. And it would be much more helpful to see reviews from actual REI users as opposed to dozens of comments from Stanley's website.

I LOVE this tumbler! I fill it daily with ice then add my protein drink. It keeps my drink very cold all day and the ice slowly melts so I get water the rest of the day. The flip top is great for ensuring no spills and staying clean. The next morning there is still about a cup of ice in the tumbler! I gave only 4 stars because the straw is initially difficult to use with ice - the ice gets stuck to the sides and it is hard to insert the straw because of this. I've tried inserting the straw before adding ice, and the ice won't move so the straw comes off the grommet on the lid when twisting the lid on. I also would love a stainless steel straw option. None of these are game changers for me. I'd buy another in a heartbeat!