Stanley may be the brand most people associate with big handled tumblers, but Owala is clearly trying to take a piece of that market with new tumbler designs, colors, and lid ideas.
Both brands deserve the attention. This isn’t just hype. Stanley and Owala make some of the best tumblers I’ve tested.
For this comparison, I’m focusing on the two models I enjoy using most: the Stanley IceFlow and the Owala FreeSip Sway. I also have separate rankings of the best Stanley tumblers and best Owala products if you want to compare more options from each brand.
My testing was close. The Stanley IceFlow scored 4.4 out of 5, while the Owala FreeSip Sway scored 4.5. Stanley is tough and practical, but I still lean toward the Sway. Here’s how they compare in insulation, lid usability, portability, cleaning, durability, and versatility.
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Stanley IceFlow | Owala FreeSip Sway | |
|---|---|---|
 |  | |
Recommended Size | 30 oz | 30 oz |
Price | $35 | $35 |
Material | 18/8 stainless steel | 18/8 stainless steel |
Fits cup holders? | YES | YES |
Leakproof? | YES | YES |
Can be used with hot liquids? | NO | NO |
Dishwasher safe? | YES | NO |
Warranty | Lifetime | Lifetime |
Review | ||
My Score | 4.4/5 | 4.5/5 |
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Insulation
Both tumblers are insulated, but there’s one subtle difference: the Stanley IceFlow uses double-wall vacuum insulation, while the Owala FreeSip Sway has three walls. On paper, Owala should have the advantage. In real use, the difference was tiny.
In my 24-hour cold test, the Stanley went from 33.8°F (1°C) to 55.8°F (13.2°C).
The Owala FreeSip Sway went from 33.8°F (1°C) to 55.2°F (12.9°C).
Both tests were done in the same conditions, with no ice.
So yes, Owala technically won, but by only 0.6°F (0.3°C). You wouldn’t notice that while drinking. I’d call both results very good, although I’ve tested other tumblers and bottles with even stronger insulation.
One important note: neither tumbler is made for hot drinks. Both lids can build pressure, so I’d avoid very hot liquids. I sometimes use them with carbonated drinks, but be careful. If pressure builds up, your drink can spray a little when you open the lid.
Lid Usability
This is where the Owala FreeSip Sway beats the Stanley IceFlow for me.
Not because the IceFlow has a bad lid. It doesn’t. I actually like it a lot. But the Owala lid is more enjoyable to use, and the reason is simple: the FreeSip spout.
I’ve said it before, and I still stand by it: Owala has one of the best drinking setups in the drinkware space. You get two drinking options in one spout. You can sip through the straw or tilt the bottle back and chug. No lid swapping. No unscrewing.
Think about it – sometimes you want to sip casually in the car. Other times, you want a bigger drink after walking outside or finishing a workout. Owala lets you do both from the same opening.
The spout is also hidden under a cap – a big win for hygiene. I’d rather drink from a covered spout than from a straw that has been sitting out in the open collecting dust, lint, and random debris. That’s one of the reasons I grab Owala more often when I’m heading outside.
And if you tend to toss your bottles and tumblers into a bag, backpack, or car seat without thinking too much, the Sway has one more feature you’ll appreciate: a locking mechanism.
Since the lid opens with a button, that lock matters. It helps prevent accidental openings, which is exactly what I want to see on any push-button bottle or tumbler.
The Stanley IceFlow is better than most exposed-straw tumblers because the straw folds down into the lid. That helps a lot. But it’s still mainly a sipping tumbler. The straw is connected to the spout, and while the folded design is cleaner than a straw sticking straight up, I still prefer Owala’s fully covered setup.
Technically, you can unscrew the IceFlow lid and drink from the wide opening, but I wouldn’t do that while walking or driving unless you enjoy wearing your water. That’s where Owala makes more sense. It gives you a proper chug option without making a mess.
Stanley does have one lid feature I really like: the handle is rigid and sturdy, so you can use it as leverage when unscrewing the lid. That makes opening the tumbler quicker and less annoying, especially compared with some tumblers that take a few tries to twist open.
Still, Owala wins this category. The IceFlow lid is good, but the FreeSip lid is simply better to drink from.
Portability
Portability is a strong point for both tumblers.
The main reason is the handle. Both the Stanley IceFlow and Owala FreeSip Sway use big lid handles that let you carry the tumbler with a full grip.
I much prefer this over those oversized side handles that look great in Instagram photos but feel awkward once you actually carry a full 30 oz tumbler for more than five minutes.
With these two, your hand sits in a more natural position, your wrist doesn’t fight the weight as much, and carrying the tumbler from the car to the gym, office, beach, or wherever else feels much less annoying.
Both the Stanley IceFlow and Owala FreeSip Sway fit my car cup holder perfectly. They sit securely, don’t wobble around like crazy, and are easy enough to grab while driving. For road trips, errands, commuting, or just keeping water next to you in the car, both are excellent.
Weight is where Owala pulls slightly ahead. I own both in the 30 oz size, and my FreeSip Sway weighs 16.9 oz empty, while the IceFlow weighs 19.45 oz.
Ease of Cleaning
Neither of these tumblers is the fastest to clean, but I’d rather clean the Owala FreeSip Sway than the Stanley IceFlow.
I actually timed both by hand. The Sway took me 2 minutes and 50 seconds. The IceFlow took 3 minutes and 18 seconds. So the gap isn’t huge, but the Stanley feels more annoying than the timer makes it look.
The actual washing part is easy enough with both. The mouths are wide, so you can use a sponge or a regular bottle brush without fighting your way inside. You’ll also need a straw brush because both tumblers use straws, and that’s not something I’d skip, especially if you drink anything other than plain water.
The lid is where Stanley starts testing my patience.
The Owala FreeSip Sway has 5 parts. The Stanley IceFlow has 6. That one extra piece isn’t the whole problem, though. The bigger issue is the IceFlow spout. Removing it and putting it back in place takes more force than I’d like, and sometimes I need a few tries before it sits right again. It’s not impossible, just a little irritating for something you may clean every day.
Of course, if you only drink water, you don’t need to fully disassemble every tiny part after every use. But if you drink iced coffee, juice, electrolyte drinks, flavored water, or anything sugary, I’d clean the lid properly. Once smell settles into silicone gaskets or hidden lid parts, getting rid of it can be a pain.
So Owala wins this category for me. It’s not exactly quick, but it’s less frustrating. If you want the full step-by-step process, I show it in my guides on how to clean Owala and how to clean Stanley tumblers.
Durability & Materials
After using both tumblers for months, I’d say the Stanley IceFlow feels a little more durable than the Owala FreeSip Sway. Not by a huge margin, but enough that I notice it when I hold them side by side.
My main durability concern with the Sway is the push-button lid. This is not only about the Sway, but Owala lids in general. I’ve seen some reviews from people saying the button fell out or the spring broke. That hasn’t happened to me, and my lid still works exactly as it should, but any button-and-spring design gives me a little more pause than a simpler flip straw lid.
If that does happen, I’d file a warranty claim. Owala offers a lifetime warranty, just like Stanley, and if the issue is not caused by misuse, there’s a good chance they’ll replace the bottle or lid.
But I don’t want to make the Sway sound flimsy. It’s not. The body is made from 18/8 stainless steel, and it feels sturdy enough for normal daily use.
Stanley just feels a bit more reinforced in the areas that usually take the most abuse. The IceFlow lid uses thick plastic, the handle feels rigid, and the whole tumbler has that slightly tougher feel.
Both lids are plastic, but they’re BPA-free, BPS-free, and phthalate-free, so that’s not something I worry about with either one.
There is one safety difference worth mentioning, though. Stanley uses lead in the vacuum-sealing construction, while Owala says it has never used lead in its products.
To be fair, Stanley is far from the only brand that uses lead this way. Many stainless steel bottle brands use it to seal the vacuum insulation, and under normal use, it should not touch your water.
The risk comes if the bottom seal is badly damaged and the internal sealing material becomes exposed. If that happens, I’d stop using the tumbler and replace it.
So for pure toughness, I’d give this category to Stanley. But if you’re very cautious about materials and want a lead-free construction, Owala is the safer pick.
Verdict: Owala FreeSip Sway Is the Winner
You can’t really go wrong with either one. The Stanley IceFlow feels tough, the lid is sturdy, the handle is practical, and the insulation is strong. For around $35, the 30 oz version is a good buy.
But the Owala FreeSip Sway won me over.
The FreeSip spout is the biggest reason. Being able to sip or chug from the same opening makes the Sway more enjoyable to use every day. Add the covered spout, locking mechanism, lighter weight, cup-holder fit, and strong insulation, and it’s the tumbler I reach for more often.
Stanley IceFlow | Owala FreeSip Sway |
|---|---|
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My Score: 4.4/5 | My Score: 4.5/5 |
Jeremiah Kowalski
Jeremiah Kowalski is a drinkware product researcher who has personally tested 50+ reusable water bottles, tumblers, mugs, and filtration systems from leading brands. He focuses on real-world performance, durability, and safety to help readers choose drinkware that actually fits their daily hydration needs.
