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, and own your day with Hydro Flask

SIP YOUR WAY - Flexible, soft straw lid designed for effortless sipping anytime, anywhere
BUILT FOR ADVENTURE - Robust handle and leak-resistant lid make it your ultimate travel companion
EFFORTLESS CLEAN UP - Dishwasher safe design keeps your tumbler vibrant and ready for daily hustle
PURE TASTE EVERY TIME - Pro-grade stainless steel prevents flavor transfer—freshness guaranteed
HYDRATE MORE REFILL LESS - 40 oz capacity means fewer pit stops and more productivity

The Hydro Flask 40 oz Travel Tumbler combines advanced double-wall vacuum insulation with durable stainless steel and a leak-resistant lid featuring a flexible straw. Designed to fit most cupholders and built with a sturdy handle, it keeps beverages cold for over 24 hours while ensuring pure taste and easy cleaning. Perfect for professionals on the move who demand hydration that matches their pace.

Specifications

Brand	Hydro Flask
Color	Trillium
Special Feature	Vacuum Insulated, Durable Handle, Flexible Straw, Double Wall
Style	40 Oz
Theme	Adventure
Recommended Uses For Product	Travel
Included Components	Tumbler
Specific Uses For Product	Cold Drinks, Hot Drinks
Shape	Round
Pattern	Solid
Product Care Instructions	Machine Wash, Dishwasher Safe
Age Range (Description)	Adult
Material Feature	Insulated
Reusability	Reusable
Unit Count	1.0 Count
Product Dimensions	5.75"W x 9"H
Material Type Free	BPA Free
Number of Items	1
Finish Type	Smooth
Manufacturer	Hydro Flask
UPC	810096853837
Size	40 Oz
Item Package Dimensions L x W x H	13.19 x 5 x 5 inches
Package Weight	0.69 Kilograms
Item Dimensions LxWxH	5.75 x 5.75 x 9 inches
Brand Name	Hydro Flask
Warranty Description	LIFETIME
Model Name	All Around Travel Tumbler
Suggested Users	Unisex-Adult
Part Number	TT40PS678

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