Outdoor
ThermoFlask 40 oz Insulated Water Bottle with Straw Lid
Product description
All-day temperature control: This bottle features double-wall vacuum insulation engineered to keep beverages cold for up to 24 hours and hot for shorter periods. The exterior stays sweat-free to prevent condensation on bags and surfaces.
Leak-resistant straw lid: The included straw lid seals tightly when closed to minimize spills in bags. Its easy-sip design supports one-handed drinking for workouts, commuting, or driving.
Premium construction: The flask is built from 18/8 food-grade stainless steel to resist rust and avoid flavor transfer. The lid is BPA-free for safe, pure-tasting drinks.
Multiple capacity options: Available in compact 14, 16, and 18 oz versions with a narrow base for cup holders, and larger 24 oz and up models designed for backpacks, totes, and desk use. This listing includes the 40 oz size with the straw lid.
Simple maintenance: Both the bottle and the lid are dishwasher-safe for easy cleaning, and the wide mouth allows straightforward hand washing and removal of the straw components for thorough cleaning.
Pros
- Keeps drinks cold up to 24 hours
- Sweat-free exterior prevents condensation
- Durable 18/8 stainless steel and BPA-free lid
Cons
- Occasional cosmetic imperfections reported
- Some users experience lid/gasket problems over time
- Carry handle can feel delicate
VerdictA versatile, durable insulated bottle that combines long-lasting temperature control with a convenient one-handed straw lid. It’s a solid pick for gym sessions, travel, school, and daily use, though a few users report minor cosmetic defects or occasional lid issues.
Reader reviews
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Julie 5/5
Outstanding cold retention
This is my second ThermoFlask. Ice lasts overnight and it keeps water cool even left in a hot car. Highly recommend.
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dk*tx 5/5
Good option for kids
Our grandkids asked for this brand because it keeps their drinks colder longer. Works well for them.
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Vanessa Morales Rojas 5/5
Excellent
I simply adore these bottles. Very comfortable to carry at this size, water doesn't taste metallic, and it stays cold or hot for a long time.
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Martine 5/5
Well insulated, holds cold
Keeps things cold a long time, especially with ice — almost 48 hours in my experience.
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Brenda F. 5/5
My new favorite bottle...
I love the color.
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Tracy McCauley 5/5
Exactly what I wanted
Second one I own. Love the colors and features. Keeps drinks cold all day and is the perfect size.
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catlady73 1/5
Stopped sealing after 32 days
Two days past the return window the interior gasket popped out and won't stay in place, so it no longer seals. My older bottle had the same intermittent issue I could temporarily fix. Disappointing reliability compared to past experiences.
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Siens 5/5
Small cosmetic flaw, otherwise solid
I recommend this if it fits your budget. Keeps drinks cold when needed. It's a bit wider than I'd like, but comparable to my other thermoses. Mine arrived with a faint scuff near the lid — visible up close but purely cosmetic and doesn't affect performance. Beautiful holographic finish, no strong odor after washing, straw works well, and it's easy to disassemble and clean.
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Deborah 4/5
Great bottle but fragile handle
I love this flask — keeps things cold for hours and is great for the gym. Beautiful sparkly blue without being juvenile. My only gripe is the handle: it detaches when opening and is tough to reattach, so you must open it carefully.
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Mariel Molina 5/5
Pretty, but not the top performer
Doesn't keep cold as long as my Stanley or Owala, but it gets the job done. The color is gorgeous, though.
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Alan OKings 5/5
ThermoFlask fan here
I love these flasks; they feel high-quality and durable, and the colors are great. Please offer more galactic shades like purple and pink.
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