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 FUNTAINER 12 Ounce Stainless Steel Vacuum Insulated Kids Straw Bottle, Frozen 2 (Colors May Vary)

THERMOS FUNTAINER 12 Ounce Stainless Steel Vacuum Insulated Kids Straw Bottle, Frozen 2 (Colors May Vary)

Product ID: 394218060

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Details

Brand
THERMOS
Capacity
340 g
Colour
Color may vary
Special Feature
Automatic
Age Range (Description)
Kid

🧴Hygienic covered straw

❄️12-hour cold retention

🛡️18/8 stainless steel durability

Description

❄️ Keep it cool, keep it fun—hydration that’s as tough as your little one!

CLEAN GERM FREE - Pop-up straw with hygienic cover and removable design for effortless, thorough cleaning.
STAY CHILL ALL DAY - Vacuum insulation keeps drinks icy cold for up to 12 hours—no more lukewarm disappointments.
BUILT TO BRAVE THE ROUGH - Premium 18/8 stainless steel withstands drops and dings from everyday kid adventures.
KID APPROVED CONVENIENCE - Lightweight, compact with a soft-touch carry handle and easy push-button lid for on-the-go hydration.
DISHWASHER SAFE DURABILITY - Designed for busy parents—safe for dishwasher cleaning, though hand wash recommended for longevity.

The THERMOS FUNTAINER 12oz Stainless Steel Kids Straw Bottle combines advanced vacuum insulation technology to keep drinks cold for up to 12 hours with rugged 18/8 stainless steel construction designed to endure daily kid use. Featuring a hygienic covered pop-up straw and a lightweight, easy-carry design, this bottle ensures clean, convenient hydration on the go. Dishwasher safe and built in the USA, it’s the ultimate hydration companion for active kids.

Specifications

Brand	THERMOS
Capacity	340 g
Colour	Color may vary
Special Feature	Automatic Drainage, Lightweight
Age Range (Description)	Kid
Model Name	FUNTAINER 12 Ounce Bottle
Item Weight	227 g
Material	Stainless Steel
Number of Items	1
Pattern	Bottle
Included Components	kids water bottle
Product Care Instructions	Dishwasher Safe
Base Diameter	2.7 Inches
Cap Type	Straw Cap
With Lid	Yes
Is Dishwasher Safe	Yes
Is Microwaveable	No
Is Oven Safe	No
UPC	041205750123
Manufacturer	Thermos
Global Trade Identification Number	00041205750123
Country of Origin	USA
Item model number	F4102FZ6
ASIN	B08Z7467XC

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THERMOS FUNTAINER 12 Ounce Stainless Steel Vacuum Insulated Kids Straw Bottle, Frozen 2 (Colors May Vary)

Details

Description

Specifications

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