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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🦄 Sip in Style, Stay Cool, and Join the Hydration Squad!

STAY CHILL ALL DAY - Vacuum insulation keeps drinks icy cold for up to 12 hours—no more lukewarm sips!
GERM FREE HYDRATION - Covered silicone straw pops up for easy sipping and seals out germs—clean drinking guaranteed.
KID APPROVED CONVENIENCE - Lightweight design with a soft-touch carry handle and push-button lid makes hydration effortless.
TRUSTED LEGACY MODERN FUN - From a brand with 120+ years of innovation, now in a vibrant Space Unicorn design that stands out.
BUILT TO BRAVE THE PLAYGROUND - Premium 18/8 stainless steel resists dents and drops, perfect for active kids on the go.

The THERMOS FUNTAINER 12oz Space Unicorn water bottle combines advanced vacuum insulation technology to keep drinks cold for 12 hours with rugged 18/8 stainless steel durability. Designed specifically for kids, it features a hygienic pop-up straw and an easy-carry soft grip handle, making it the perfect hydration companion for school and play. Backed by over a century of trusted Thermos innovation, this bottle delivers both fun and function in a compact, dishwasher-safe design.

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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	113 g

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

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