What material is the lid?

It's a rubbery feeling plastic (I think polyethylene).

Does this lid fit all Keep Cup sizes? I accidentally melted the twisting bit of mine in the dishwasher.

I have many different Keep Cups and the 8 oz size and 12 0z size lids are interchangable. I am not sure about the thermal, because mine dripped coffee - it did not seal properly - and it would drip on my clothes when traveling so I got rid of the thermal cup.

Is this microwave safe?

This is the stainless steel version and would not be safe for use in a microwave.

How long does this keep your drink warm

I did a short test using my 12oz Thermal, filled the cup with water heated to 163°F/72.8°C, then put on the lid and started waiting. After 10 minutes it had cooled down to 154°F/67.8°C, 20 minutes 149°F/65°C, 30 minutes 146°F/63.3°C. This cup would likely not be my first choice if I wanted my drink to stay hot as long as possible (I would instead recommend like a thicker double-walled vessel with screw-on lid, for example, a Zojirushi, Yeti, or Tiger thermos). While I do generally prefer the KeepCup's drinking experience over a more traditional thermos, there is a trade-off in heat retention. I think it is also worth mentioning that James Hoffmann did a similar test in his "The Best Reusable Coffee Cups - 2019 Edition" video on YT, at the 2:54 mark there is a chart of detailing insulation results for the various cups tested, including a 6oz KeepCup Thermal. Per his test, and starting with water at 158°F/70°C, the 6oz cup was down to 141.8°F/61°C after 10 minutes, 136.4°F/58°C after 20, and 131.9°F/55.5°C after 30 - so it would seem that the larger 12oz Thermal model does have slightly better heat retention than the smaller 6oz cup.

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Sip Sustainably ☕ - Elevate your coffee game with every refill!

DURABLE STYLISH - Built to last with a sleek matte finish, perfect for the modern professional.
SUSTAINABLE SIPPING - Make a positive impact with every cup—just 66 uses to go green!
PURE TASTE TECHNOLOGY - Electropolished stainless steel ensures your coffee tastes just as it should.
BARISTA APPROVED DESIGN - Crafted for a consistent coffee experience, whether at home or your favorite café.
SPLASHPROOF CONVENIENCE - Enjoy your drink on the go without the mess—splashproof lid included!

The KeepCup Thermal is a 12oz reusable coffee cup made from electropolished 18/8 stainless steel, designed for durability and pure taste. With a splashproof lid and a commitment to sustainability, this cup is perfect for eco-conscious coffee lovers who want to enjoy their favorite brew at home or on the go.

Reviews

Y**A

Amazing KeepCup

It was live from the first sight. The cup is extremely ergonomic, very comfortable to use. Leakproof, once I had it closed in the backpack with some coffee inside, and everything stayed dry. The cup absorbs coffee’s odor, even after washing it’s still there. But this will happen with any type of material except glass.

21.03.2020

M**I

A+

Highly recommended

27.12.2023

I**R

A Great Great Product!

For a long time, I wanted to stop using single-use cups. So I looked for a good, long-lasting product. *this is the best* I've seen! The keepcup is well built, it keeps the coffee hot for 2 hours, and by now, it saved the waste of 400 single-use cups. Well done.

30.03.2020

Y**D

Not good to move around

It keep my coffee hot but its not the best for transportation without leaking, even it leaks sometimes when I drink from it. I am going to buy another and maybe used this at the office.

8.04.2025

D**K

Poor product quality

The cover does not seal and so liquid escapes when drinking. Had one cup replaced and the second one came also defective. Not worth the price. Poor product quality, unfortunately

17.02.2023

L**L

Its not leak proof

I LOOOOOOVE THIS CUP. It makes me feel like Im drinking a cup of coffe from Starbucks. But why if i love it so much, the low rate? This cup is NOT leak proof. And for some reason, i hate the taste of matcha in this cup, so i only use it for coffe and I always end up using a ceramic coated cup.

28.01.2021

K**.

Amazing product, yet very poor delivery service for Amazon Prime Customer

Does an Amazon prime customer normally receives his orders in such a condition?Thankfully, the product survived the trip.I love the product, but my star rating goes to the poor delivery service. Not the first time though this year!

23.02.2020

S**E

Leaks!!

after about three weeks, the seal no longer works, it leaks! it being leak proof was the only reason i chose this over other eco-friendly coffee cups

10.03.2020

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TrustScore 4.5 | 7,300+ reviews

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Reusability	Reusable
Finish Types	Matte
Material Type Free	BPA & BPS Free
Product Care Instructions	Hand Wash Only
Material Features	Electropolished 18/8 stainless steel, Vacuum insulated, BPS/BPA-free
Material Type	Stainless Steel
Item Weight	0.21 Kilograms
Number of Items	1
Item Dimensions W x H	3.3"W x 5.2"H
Unit Count	1.0 Count
Capacity	12 Fluid Ounces
Shape	Round
Pattern	Solid
Theme	Coffee
Occasion	Reuse
Color	Alder
Style Name	Medium
Additional Features	BPS/BPA-free, Vacuum Insulated

KeepCup Thermal - Vacuum Insulated Stainless Steel, Reusable Coffee Cup with Splashproof Sipper Lid, Medium 12oz/340ml - Alder

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