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!

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

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).

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🦄 Hydrate like a legend—cool, durable, and totally unicorn-approved!

STAY CHILL ALL DAY - Vacuum insulation technology locks in cold for up to 12 hours—because lukewarm is so last season.
KID APPROVED CONVENIENCE - Lightweight design with a push-button flip lid and soft-touch carry handle makes hydration effortless on the go.
CLEAN GERM FREE SIPPING - Removable, covered silicone straw keeps germs out and is dishwasher safe for hassle-free cleaning.
TRUSTED LEGACY MODERN FUN - Backed by 120 years of Thermos innovation, this Space Unicorn bottle blends reliability with playful style.
BUILT TO BRAVE THE PLAYGROUND - Premium 18/8 stainless steel resists dents and drops, keeping up with your kid’s active lifestyle.

The THERMOS FUNTAINER 12oz Space Unicorn water bottle features double-wall vacuum insulation to keep drinks cold for up to 12 hours. Crafted from durable 18/8 stainless steel, it’s designed to withstand daily kid-powered wear and tear. The lightweight bottle includes a push-button flip lid with a hygienic covered straw that’s easy to clean. Trusted by families for over a century, this bottle combines playful design with professional-grade performance.

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Manufacturer	THERMOS
Model Number	F4102UC6
Package Dimensions	17.6 x 7.5 x 6.9 cm
Material	Stainless Steel
Color	Space Unicorn
Size	355 ml
Special Features	Cold 12 Hours, Double Wall
Cap Type	Flip Top Cap
Package Weight	0.24 Kilograms
Batteries Required	No
Batteries Included	No
Material Care Instructions	Hand Wash Only, Machine Wash
Brand Name	サーモス(THERMOS)
Capacity	340 g
Item Weight	0.25 Pounds

THERMOS FUNTAINER Water Bottle with Straw - 12oz Space Unicorn - Stainless Steel Vacuum Insulated Water Bottle for Kids with Lid

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