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

Product ID: 553534427

Details

Brand
Hydro Flask
Capacity
40 fluid
Color
Black
Material
Stainless
Special Feature
Double Wall

💧Leak-resistant press-in lid with flexible straw

❄️40 oz capacity for max hydration

🛡️Double-wall vacuum insulation locks cold

96655CFA

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

❄️ Stay Cool, Sip Smart — The Ultimate Hydration Sidekick

ICE COLD ALL DAY - TempShield® double-wall vacuum insulation guarantees your drink stays refreshingly cold for hours.
PURE TASTE ALWAYS - Pro-grade stainless steel prevents flavor transfer, so every sip tastes fresh and clean.
NO SPILL NO STRESS - Leak-resistant lid means zero mess in your bag or car—perfect for busy professionals on the move.
SIP WITH EASE ANYWHERE - Ergonomic handle and flexible straw make on-the-go sipping effortless and stylish.
HYDRATE MORE REFILL LESS - Generous 40 oz size keeps you fueled through long workdays and weekend adventures.

The Hydro Flask 40 oz Travel Tumbler combines durable stainless steel with advanced TempShield® double-wall vacuum insulation to keep beverages cold for hours. Featuring a leak-resistant press-in lid with a flexible straw and an ergonomic handle, it fits most cupholders and is dishwasher safe. Designed for professionals and adventurers alike, this BPA-free tumbler ensures pure taste without flavor transfer, making it the go-to companion for hydration on the move.

Specifications

Age Range Description	Adult
Asin	B0C354MZR6
Best Sellers Rank	#1,268 in Sports & Outdoors (See Top 100 in Sports & Outdoors) #92 in Water Bottles
Brand Name	Hydro Flask
Capacity	40 fluid ounces
Color	Black
Customer Reviews	4.7 4.7 out of 5 stars (11,302) 4.7 out of 5 stars
Included Components	Tumbler
Item Dimensions W X H	5.75"W x 9"H
Item Type Name	Tumbler
Item Weight	1.5 pounds
Manufacturer	Hydro Flask
Manufacturer Part Number	TT40PS001
Manufacturer Warranty Description	LIFETIME
Material Features	Insulated
Material Type	Stainless Steel
Model Number	TT40PS001
Number Of Items	1
Occasion	Baby Shower, Bachelor Party, Bachelorette Party, Back To School, Birthday, Bridal Shower, Christmas, Cinco de Mayo, Cocktail Party, Father's Day, Graduation, Housewarming, Independence Day, Memorial Day, Mother's Day, New Year, Valentine's Day, Wedding
Other Special Features Of The Product	Double Wall, Durable Handle, Flexible Straw, Vacuum Insulated
Pattern	Solid
Product Care Instructions	Dishwasher Safe, Machine Wash
Product Style	40 Oz
Recommended Uses For Product	Travel
Reusability	Reusable
Shape	Round
Size	40 Ounces
Specific Uses For Product	Cold Drinks, Hot Drinks
Theme	Adventure
Unit Count	1 Count
Upc	810096856722

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