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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Thermos 12-Ounce Funtainer Bottle, Blue

Product ID: 52754439

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Details

Brand
Thermos
Capacity
12 Fluid
Colour
Blue
Recommended uses for product
Water
Special feature
Cold 12 Hours

💧Durable stainless steel, leak-resistant

🔒Vacuum insulation locks in freshness

❄️Keeps drinks cold for 12 hours

Description

❄️ Sip Smart, Stay Cool – Your Ultimate Cold Companion

BUILT TO LAST - Robust stainless steel interior and exterior ensure your bottle withstands daily hustle and travel without a scratch.
CLEAN READY - Hand wash recommended to maintain pristine condition and long-lasting performance, keeping your hydration game strong.
PERFECTLY PORTABLE - Compact 12-ounce size fits perfectly in your bag or cup holder—ideal for busy professionals who value convenience.
STAY CHILL ALL DAY - Advanced vacuum insulation technology keeps your drink icy cold for up to 12 hours—no more lukewarm sips at your desk.
EFFORTLESS HYDRATION - Hygienic push-button lid with pop-up straw and integrated carry handle makes sipping and carrying seamless on the go.

The Thermos 12-Ounce Funtainer Bottle in Blue features cutting-edge vacuum insulation technology that keeps beverages cold for up to 12 hours. Crafted with durable stainless steel inside and out, it offers a hygienic push-button lid with a pop-up straw and an integrated carry handle for easy use and portability. Lightweight and compact, this bottle is perfect for professionals seeking reliable, stylish hydration throughout their busy day.

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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

Thermos 12-Ounce Funtainer Bottle, Blue

Details

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