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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❄️ Sip in Style, Stay Cool All Day!

STAY CHILL ALL DAY - Keeps your drinks icy cold for up to 12 hours—no more lukewarm sips.
ONE TOUCH HYDRATION - Push-button lid with pop-up straw for quick, hygienic sipping on the go.
TRUSTED VACUUM SEAL - Advanced Thermos vacuum insulation locks in freshness and flavor.
COMPACT LIGHTWEIGHT - Perfect 12 oz size fits your lifestyle—easy to carry, easy to clean (hand wash recommended).
DURABLE STAINLESS STEEL - Built to last with a sleek, rust-resistant double-wall design.

The Thermos Funtainer 12-Ounce Bottle features Thermos’ signature vacuum insulation technology to keep beverages cold for up to 12 hours. Crafted from durable stainless steel with a hygienic push-button lid and pop-up straw, this compact 355 ml bottle is designed for active professionals seeking reliable, stylish hydration on the go.

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Manufacturer	Thermos
Model Number	F4101
Package Dimensions	17 x 7 x 7 cm
Material	Stainless Steel
Color	blue
Volume	355 Milliliters
Size	355 ml
Special Features	Cold 12 Hours, Double Wall, Vacuum Insulated
Volume Capacity	0.35 L
Package Weight	0.24 Kilograms
Batteries Required	No
Batteries Included	No
Material Care Instructions	Hand Wash Only
Brand Name	サーモス(THERMOS)
Capacity	12 Fluid Ounces
Item Weight	181 g

Thermos Funtainer 12オンスボトル 12-Ounce ブルー F4013BL6

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