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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Description

❄️ Stay Cool, Sip Smart — The Ultimate Travel Tumbler for the On-the-Go Pro

SIP WITH EASE ANYWHERE - Leak-resistant lid with soft, flexible straw lets you sip comfortably without spills or fuss.
HYDRATE MORE REFILL LESS - Generous 40 oz size fits most cupholders for all-day hydration on the go.
PURE TASTE ZERO COMPROMISE - Pro-grade stainless steel ensures no flavor transfer, BPA-free for clean, fresh sips every time.
ICE COLD REFRESHMENT ALWAYS - TempShield double-wall vacuum insulation locks in chill for hours, so your drink stays perfectly cold.
BUILT FOR YOUR ACTIVE LIFESTYLE - Durable stainless steel and sturdy handle make it your ideal travel, gym, or outdoor companion.

The Hydro Flask 40 oz Travel Tumbler combines durable stainless steel construction 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 and is designed for active lifestyles. BPA-free and dishwasher safe, it ensures pure taste without flavor transfer, making it perfect for travel, sports, and daily hydration.

Specifications

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
Item Weight	680 g
Product Dimensions	14.2W x 32.3H Centimeters
Number of Items	1
Manufacturer	Hydro Flask
UPC	810096856722
Size	40 Oz
Department	Unisex-Adult
Country of Origin	China
Item model number	TT40PS001
ASIN	B0C354MZR6

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