Duett Stainless Steel Double Walled Vacuum Insulated Reusable 3in1 Travel Thermos Water Bottle Drink Flask with 2 Tumbler Cup Mugs Set to Share Hot or Ice Cold Coffee, Tea, Wine, Beverages (Black)

This is a great idea with mediocre execution, like so many others. Specifically, it would have been very easy to put threads on the cup rims to allow them to securely screw into the bottle. Instead, they are held on by friction applied to rubber gaskets on the bottle. This means that the cups easily slide off the bottle. The cups are also shaped such that a large amount of the object’s volume is unused space in the cups. They could have been shaped such that the cup’s interiors were filled by thermos space, increasing the volume of the vessel. The bottle is symmetrical on the up/down axis (mine has no logo), meaning you have a 50% chance of removing the cup on the bottom every time you open it, having to replace it and remove the other to pour out your drink. Finally, the lid that holds the beverage inside the bottle is plastic, when it easily could be made of metal, meaning that the whole time it’s closed boiling water is in contact with plastic, leaching whatever’s in the plastic into the beverage. I’ll be keeping it because the faults aren’t problematic enough (yet) for me to decide to return it, but the designers should take notice and fix these careless flaws.

Very good quality thermos. I took it to our trip to Canada on Christmas and it had proofed it's value. We were walking outside in 8°F basically the whole day, and at the end of the day we got our tea still hot. I was surprised, but it really holds the temperature for a whole day long. It's also nice that it comes with 2 separate cups (1 on the bottom and 1 on top) so that each of us have had our own cup.Exterior surface is kind of glossy, so it feels looks expensive. I think it would be a great gift, at least for an outdoor enthusiast.

I LOVE this! Last summer when my husband and I went to the beach we dragged along a water bottle full of wine and plastic party cups. Needless to say, enjoying warm white wine wasn't super great. Now, we can enjoy our wine cold and don't need to bring those awful party cups. This is our all in one beach solution for our beverages now. Now that's it's winter we also like to bring it up on the slopes for hot chocolate breaks! I also love the sleek design!

This product is extremely high quality. When I received the delivery and opened up the box I was pleasantly surprised by the branded packaging (which makes it great for gift-giving). The actual thermos-like container is heavy-duty and the two cups stay sealed tightly because of the o-rings. I went to an outdoor party last night, so I poured wine in the thermos and used the durable cups to share some with a friend....no worry of glass breaking!

The product was delivered on time, packaging was in good condition, the product was in good condition and appeared to be as described, and after use met expectations for fit, form, and function. Use it for those lattes on the road.

I was super excited about this! Purchased as a gift. Upon receiving I realized the cups on each end are not very sturdy. They don’t screw on, just twist on and are held in place by a silicone ring. I feel embarrassed to give as a gift. Feels clunky and cheap. Unsure 😐 what to do....

I like the tumbler so far. I think it would keep the water to be hot (to make tea) around 4 hours. The one I got the bottom cup kinda loose but I usually keep it in my package so it’s fine for me! The tumbler is pretty and good quality. And for anyone who’s wonder where it’s made is China!!

My new favorite cold cocktail bottle to use while lounging by my condo pool. Tested this and Duett performed identically to the Swell and Corkcicle vacuum insulated bottles I own. The duo cups attached is brilliant!! I now can offer to share my drink without having to lug extra disposable plastic party cups with me.