Do you need to take the lid apart to scrub and clean? Or is the dishwasher sufficient?

The small insert that slides to close the opening is easily removed so that you can clean the lid well. Stuff will collect in there. Also, handwashing is recommended, the chlorine bleach in dishwasher detergent and high water temperature/hot drying will destroy the rubber seal quickly and cause faster wear to the plastics as well as reducing the seal’s strength.

does this keep coffee hot or warm after couple hours?

It does a really good job for keeping it hot for a couple of hours and warm for another 1 or two depending on your definition

Do the different sizes nest/stack well? 12oz in 20oz? 16oz in 28oz? Or all 4? Any photos of this? Trying to compare how Yeti sizes nest / stack too.

I don't know the answer. I have the 16 ounce. I would think that one could stack them. I bought the red one and it is superb. I am just guessing that they would be wide enough to stack them, but, I am NOT sure. GREAT HYRDO FLASK, though!

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❄️ Stay Cool, Stay Ahead: The Ultimate Tumbler for the On-the-Go Pro

ICE COLD CONFIDENCE - TempShield double-wall vacuum insulation guarantees your drink stays icy for hours.
SIP IN STYLE COMFORT - Flexible, soft straw lid designed for effortless sipping anywhere, anytime.
HYDRATE MORE REFILL LESS - Generous 40 oz size keeps you fueled through long workdays and workouts.
PURE TASTE ZERO COMPROMISE - Pro-grade stainless steel ensures no flavor transfer—always fresh, always clean.
LEAK RESISTANT TRAVEL READY - Press-in lid prevents spills, perfect for your daily commute or outdoor adventures.

The Hydro Flask 40 oz Travel Tumbler in sleek black combines durable stainless steel with double-wall vacuum insulation to keep drinks cold for hours. Featuring a leak-resistant lid with a flexible straw and a sturdy handle, it fits most cupholders for seamless portability. Designed for professionals and adventurers alike, this BPA-free tumbler delivers pure taste without flavor transfer, making it the perfect hydration companion for any setting.

Brand	Hydro Flask
Colour	Black
Special Feature	Double Wall, Durable Handle, Flexible Straw, Vacuum Insulated
Style	40 Oz
Theme	Sports
Recommended Uses For Product	Travel
Included Components	Tumbler
Specific Uses For Product	Cold Drinks, Hot Drinks
Shape	Round
Pattern	Solid
Product Care Instructions	Dishwasher Safe, Machine Wash
Age Range (Description)	Adult
Material Feature	Insulated
Reusability	Reusable
Net Quantity	1.0 count
Product Dimensions	14.2W x 32.3H Centimeters
Number of Items	1
Manufacturer	Hydro Flask
UPC	810096856722
Size	40 Oz
Department	Unisex-Adult
Item model number	TT40PS001
ASIN	B0C354MZR6

Hydro Flask 40 Oz Travel Tumbler with Handle, Lid and Straw - Insulated Stainless Steel in Black

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