Can you not store milk in these? Looking for a way to keep my son's soy milk cold without lugging an ice pack.

You can definitely put milk in this thermos, but to keep it ice cold you need a water bottle ice pack (the myColdCup ones on Amazon). These work really well because the ice pack is put *inside* the thermos (rather than a bulky ice pack outside), so it does not need to be nearly so big to have the same cold effect. One ice pack in this 12 oz thermos will keep the milk really ice-cold for more than 8 hrs. He will love it!

is this bottle leakproof?

Yes, is is leakproof. If the top is screwed on correctly (not misthreaded) and the straw is pulled through tight, it will NOT leak. The few times we’ve had it leak is due to user error. Though it will obviously leak (little dribbles) if the top is not closed and the bottle is turned upside down or laid on its side. For reference, we’re probably going to buy this for the third time in two years because it keeps getting lost. It’s leak proof and easy to clean (no mold).

Can this bottle be filled with hot water and keep the water warm for hours?

No. It says that ON THE BOTTLE. It’s not for hot liquids

Can i use it for milk

Yes, this could be used for milk, or any other cod beverage.

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❄️ Stay cool, stay ahead—hydrate like a pro!

SIP WITH EASE - Hygienic push-button lid with pop-up straw offers quick, spill-free hydration during meetings or workouts.
CARRY CONFIDENTLY - Integrated carry handle makes it effortless to bring your favorite beverage wherever your busy day takes you.
PERFECTLY PORTABLE - Compact 12-ounce capacity fits seamlessly into your bag without weighing you down—hydration meets convenience.
STAY CHILL ALL DAY - Advanced THERMOS vacuum insulation technology keeps your drink icy cold for up to 12 hours—no more lukewarm disappointments.
BUILT TO LAST DESIGNED TO IMPRESS - Premium stainless steel interior and exterior ensure durability and a sleek, professional look that fits your on-the-go lifestyle.

The Thermos 12-Ounce Funtainer Bottle in Blue features THERMOS vacuum insulation technology that keeps beverages cold for up to 12 hours. Crafted with durable stainless steel inside and out, it includes a hygienic push-button lid with a pop-up straw and an integrated carry handle for easy transport. Lightweight and compact, this bottle is perfect for professionals seeking reliable, stylish hydration on the go.

Reviews

A**R

Great stay cool water bottle for kids

There has been a change to the design so in my opinion it is nowhere near as robust as the previous ones I have purchased.However it still remains a great buy as the bottle contents stay very cool for hours, perfect.

7.09.2025

M**A

The straw inside the bottle is plastic no silicone !

I am disappointed, the straw inside the bottle is plastic, not silicone and for this price I was expecting something more healthy, it’s 😞 so sad. Now I need to buy another bottle just to have silicone straw !!

27.08.2022

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Brand	Thermos
Model Number	F4100NY6
Colour	Blue
Product Dimensions	6.6 x 6.6 x 17.78 cm; 181.44 g
Capacity	12 Fluid Ounces
Material	Stainless Steel
Special Features	Cold 12 Hours, Double Wall, Vacuum Insulated
Item Weight	181 g

Thermos12-Ounce Funtainer Bottle, Blue

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