The right water bottle gets a child drinking more through the school day and survives being dropped and stuffed in a backpack, and the best one depends on how your child drinks and whether cold water matters. For the best all-round mix of insulation, a spill-resistant lid, and durability, the Owala Kids FreeSip 16oz is our top pick. For proven cold-keeping for less, the Thermos FUNtainer 12oz is the value choice. And for an easy-sipping bite valve on a dishwasher-safe stainless bottle, the CamelBak Eddy+ Kids is the differentiator.
The one thing that shapes this choice is how your child prefers to drink and how much you care about cold water. The Owala's FreeSip spout lets a kid either sip through a straw or swig from the opening, and its insulation is rated to 24 hours cold. The Thermos uses a push-button straw and is rated to 12 hours. The CamelBak has a beloved bite valve — but, honestly, it's the single-wall model and not insulated at all, a real trade you should weigh before buying.
All three are proper kid-tough bottles rather than fragile cups, and each wins a clearly different job: all-round performance, best value, or an easy bite valve. Pack it alongside a divided box from our best kids lunch boxes comparison for a complete school kit.
At a Glance: Our Three Picks#
Best overall insulated school bottle : View on Amazon
Best-value straw bottle : View on Amazon
The dishwasher-safe bite-valve option : View on Amazon
Who this comparison is for#
- Parents who want a leakproof, kid-tough bottle that survives daily drops and a crowded backpack.
- Anyone whose child drinks more when the water stays genuinely cold through a warm school day.
- Kids who have a strong drinking-style preference — straw, swig, or bite valve — that decides whether they'll actually use it.
- Budget shoppers who want proven cold performance without paying for a premium bottle.
How we picked#
- Insulated or not. The biggest difference is whether a bottle keeps water cold. We favored double-wall vacuum bottles for hot days and are upfront about the one single-wall pick and what it trades away.
- Drinking style that fits. A kid uses the bottle whose spout they like. We covered a hybrid straw-and-swig spout, a push-button straw, and a bite valve, so there's a match for your child.
- Leak resistance and toughness. School bottles get dropped and jostled. We weighted spill-resistant lids and durable stainless builds heavily, and flag where a lid part needs care.
- Easy to clean and refill. We followed each maker's own care instructions rather than assuming, note which parts stay out of the dishwasher, and give honest capacity for how often it needs a refill.
Owala Kids FreeSip 16oz — Best Overall#
The Owala Kids FreeSip 16oz is the bottle most kids should carry because it balances every feature that matters. Its signature FreeSip spout gives two ways to drink from one opening — sip upright through the built-in straw, or tip it back for a quick swig — so it suits however your child naturally drinks. Owala rates the double-wall insulation to keep drinks cold for up to 24 hours, which is the longest claim of the three here and genuinely encourages kids to drink more on a hot day, and a push-to-open lid whose carry loop doubles as a lock guards against spills in the bag.
The honest con is cleaning, and it runs the opposite way to what most people assume. Owala's own instruction is to hand-wash the stainless base with hot soapy water and a soft bottle brush to protect the finish, while the lid and straw go on the dishwasher's top rack and the gasket in the utensil basket. So it is the body, not the spout, that stays out of the machine. That's a small daily step for a bottle that otherwise does everything well. One more limit worth knowing: Owala says it is not for use with hot liquids, so this is a cold-drinks bottle only.
Key specs#
Capacity : 16 ounces
Insulation : Double-wall, rated to keep drinks cold up to 24 hours
Spout : FreeSip — straw sip or swig from one opening
Lid : Push-to-open lid; carry loop doubles as a lock
Cleaning : Hand-wash the stainless base; lid and straw are dishwasher-safe on the top rack
Not for : Hot liquids
Best for : The best all-round mix of insulation, spout, and durability
Bottom line. The do-everything kids' bottle — a 24-hour cold rating, a versatile FreeSip spout, and a locking loop. Just hand-wash the base.
Thermos FUNtainer 12oz — Best Value#
The Thermos FUNtainer 12oz is the value pick because it delivers the cold-keeping performance Thermos is known for at a friendlier price. Thermos rates its vacuum insulation to keep drinks cold for up to 12 hours, and the push-button lid pops up a straw with one press — easy for small hands and satisfying enough that kids reach for it. The 18/8 stainless body shrugs off the daily drops of school life, the straw sits under a hygienic cover and lifts out for cleaning, and the familiar character designs make it a bottle kids are happy to carry.
The trade-off is size. At 12 ounces it holds less than the Owala, so a thirsty child on a full school day may drain it and need a refill before the last bell. For younger kids or shorter days that capacity is plenty, and the smaller size fits little hands and lunch bags easily. If you want dependable, proven cold-keeping without paying premium money, and a midday refill isn't a dealbreaker, the FUNtainer is the smart value bottle.
Key specs#
Capacity : 12 ounces
Insulation : Vacuum insulated, rated to keep drinks cold up to 12 hours
Spout : Push-button pop-up straw, covered and removable for cleaning
Build : 18/8 stainless steel, dishwasher safe
Not for : Hot liquids
Note : Smaller capacity may need a midday refill
Best for : Proven cold-keeping performance at the best value
Bottom line. The value cold-keeper — trusted Thermos insulation and an easy straw for less. Just know 12 ounces may mean a midday refill for thirsty kids.
CamelBak Eddy+ Kids 14 oz Stainless Steel Single Wall — Easy Bite Valve#
The CamelBak Eddy+ Kids is the pick for children who love the brand's signature bite valve — you bite and sip with no buttons to press, and it's spill-proof until a tooth actually pulls on it. Kids who've used a CamelBak often won't drink from anything else, and the stainless version adds a tougher, more grown-up build than the plastic original. The valve and straw are simple for small mouths, and the bottle handles the knocks of a school day well.
Here's the honest trade, stated plainly. CamelBak's own product name for it is "Eddy+ Kids 14 oz Bottle, Stainless Steel Single Wall" — 18/8 steel with no vacuum layer. Be careful shopping, though: the Amazon listing title drops the words "Single Wall", so the thing to check is the bullet that reads "Durable 18/8 Single wall stainless steel". so it does not keep water cold the way the Owala and Thermos do, and you should expect water to warm toward room temperature over a hot morning. CamelBak does sell a vacuum-insulated Eddy+ Kids as a separate bottle, so check which one you are adding to the basket. What you get in return here is a simpler, lighter bottle whose cap and vessel are both dishwasher-safe, so it is the easiest of the three to clean top to bottom. If the bite valve is what makes your child drink and cold water isn't the priority, that's a fair swap; if all-day cold matters, choose one of the insulated picks instead.
Key specs#
Capacity : 14 ounces (414 ml)
Insulation : Single-wall 18/8 stainless — NOT vacuum insulated, doesn't keep cold
Spout : Spill-proof bite valve, no buttons
Cleaning : Cap and vessel both dishwasher-safe
Age : Recommended for ages 3+
Trade-off : Water warms up; simpler build in return
Best for : Kids who love a bite valve and don't need cold water
Bottom line. The bite-valve pick — easy spill-proof sipping on a fully dishwasher-safe stainless bottle. Just know it is CamelBak's Single Wall model, so it won't keep water cold.
Which one should you buy?#
For most kids, buy the Owala Kids FreeSip 16oz. Its insulation is rated to 24 hours cold, the FreeSip spout suits any drinking style, and the locking loop guards the backpack against spills. Just plan to hand-wash the stainless base rather than machine-washing it.
If you want proven cold-keeping for less, buy the Thermos FUNtainer 12oz. Vacuum insulation rated to 12 hours and an easy push-button straw make it a dependable value bottle. Choose it knowing the 12-ounce size may need a midday refill for a thirsty child.
If your child loves a bite valve, buy the CamelBak Eddy+ Kids stainless. The spill-proof valve and dishwasher-safe body are a genuine plus. But be clear-eyed: it's single-wall, so it won't keep water cold like the insulated picks.
Whichever you choose, match the bottle to how your child drinks and whether cold matters. Then complete the kit with a divided box from our best kids lunch boxes comparison.
FAQ#
Which kids' water bottle keeps water coldest?#
The Owala is rated to keep drinks cold for up to 24 hours and the Thermos FUNtainer for up to 12 — both are double-wall vacuum bottles, and cold water is what encourages kids to drink more on a hot day. The CamelBak Eddy+ Kids Stainless Steel Single Wall, by contrast, has no vacuum layer, so its water warms toward room temperature over a morning. If keeping water cold through the school day is your priority, choose the Owala or the Thermos rather than the CamelBak.
Is the stainless CamelBak insulated?#
No, and it's important to know before buying. CamelBak's own product name for it is the "Stainless Steel Single Wall" model — 18/8 steel with no vacuum layer — so it does not keep water cold the way the Owala and Thermos do. Note that Amazon's listing title omits "Single Wall", so check the bullet reading "Durable 18/8 Single wall stainless steel". Its appeal is the spill-proof bite valve and a cap and vessel that are both dishwasher-safe, not temperature control. CamelBak sells a separate vacuum-insulated Eddy+ Kids if cold matters.
What size water bottle is best for school?#
It depends on your child's age and how long the day runs. The 16-ounce Owala holds the most and is least likely to need a midday refill, making it a good all-day choice. The CamelBak sits in the middle at 14 ounces. The 12-ounce Thermos is lightest and fits small hands and lunch bags easily, but a thirsty child on a full day may empty it before the last bell. For older kids or long days, lean larger; for younger kids or shorter days, the smaller bottle is plenty.
Are these bottles easy to clean?#
All three are manageable, but each maker draws the line somewhere different, and none of them says "just put it in the dishwasher". CamelBak is the most permissive: it states that both the cap and the vessel are dishwasher-safe. Thermos says the FUNtainer can go in the dishwasher "though washing by hand is recommended", and its straw lifts out for cleaning. Owala is the most specific: hand-wash the stainless base with hot soapy water and a bottle brush to protect the finish, and put the lid and straw on the dishwasher's top rack with the gasket in the utensil basket. So with the Owala it is the body that stays out of the machine, not the spout.