Mainstays 40 oz Stainless Steel Tumbler with Straw, Handle and Double-Wall Insulation, Black

40 Ounces. Insulated, and kept my drink nice and cold for 5 plus hours outside - even though the temps went to the mid 80s', and the cup is BLACK... I was a bit surprised my drink was still cold under the blaring sun on a cloudless day! Fits into a regular vehicle cup holder - built in or add on, long so if you have a deep built-in cup or add on holder in vehicle, this will fit perfectly! The lid is a twist to shut, but I never had the need to shut it, comes with a nice thick reusable straw... I did place the cup in the freezer for a quick chill - held up fine, whatever water or tea I didn't finish, would be refrigerated, and surprisingly, still fresh!

I have only been using it for a few days, but it seems to be equivalent to the brand name tumblers used by family members and at one -half to one-third the cost. It is too soon to comment on the longevity of the coating or the functionality of the lid.

I'm really impressed with the Mainstays 40 oz Stainless Steel Tumbler. For the price, it performs way better than I expected. It keeps my drinks cold for hours (even with ice), and the stainless steel feels sturdy and well made. The handle is comfortable and makes it easy to carry around, especially for long days or car trips. The straw is a nice bonus and works well for both water and iced drinks. I also like the size — it holds plenty so I don't have to constantly refill. It fits in my car's cup holder, which is a huge plus. Overall, this is a great affordable alternative to more expensive tumblers. If you want something practical, durable, and budget-friendly, this is definitely worth buying.

I left my other water bottle at work and needed another. This bottle keeps the water cold even the next day. I put ice water in about 12:40 in the afternoon on Sat. On Sunday at 8:20 in the morning it's still cold even though I still had a little water left over from the day before. That means a lot to me. It tells me it works!! It's also tall.

it will keep us overnight easily. keeps everything cold I love it. the only thing I don't like the lid is a little difficult to put on. and it's top heavy it will tilt over very easily. but I would order another one without thinking twice about it highly recommend it

I wear a CPAP mask at night and like to have cold water to drink without taking off the mask. This bottle keeps water cold for a long time, and the straw can slip under the mask edge so I can sip some without taking off the mask. It will leak if rather full and ripped over while the straw is in. And the lid is a little fussy to get started right. If the kid isnt on perfectly even, it will leak if tipped.

This is great with only two very minor things I'm not crazy about. 1 - The pink color could be brighter, bolder and glossy. Doesn't affect the quality in any way. Just personal preference. 2 - The lid tightens easily. Too easily. It frequently becomes difficult to loosen and remove. Could definitely be me getting old as I turned 60 this year and have rather small hands. If you overlook these two personal gripes, this is a great buy at the price. I use it for cold beverages while driving. It keeps them very cold and the ice cubes are still solid when the rest of the drink is gone.

ice tea stays ICE COLD!! Haven't tried hot coffee yet. The only thing wrong with this cup is NO CAP ON STRAW!! Luckily I save "things" so I muddled through my stash and found a cap that is a perfect fit!!! It's BIG but great! Holds 1 tray of ice and is cold till I go to bed around 12/1:00 a.m. You will love this "big baby"!!!

Not stainless steel on the inside. I kept getting really bizarre sore throats, unlike any sore throat I've ever had before, every time I stopped drinking my daily water from this cup, it would go away, and when I would resume drinking from it it would come back. This does not look like typical stainless steel, it has a grit and looks shinier and more chrome like. I think this is not stainless steel and is some other type of metal. I only figured it out after the 90 day period so I can't return it. But this is not safe for consumption.

I gave This tumbler the ratings because it isn't spill resistant nor spill proof. This tumbler. however will keep water very cold when I put a large (I freezer a plastic cup (disposable restaurant style size abou¼amount of ice for many hours and if I put it in the refrigerator at the end of the day it still has ice in it.