









💧 Stay cool, stay hot, stay ahead—ThermoFlask fuels your every move.
ThermoFlask’s 40 oz insulated water bottle features double-wall vacuum insulation that keeps beverages cold for 24 hours and hot for 12 hours. Made from durable, BPA-free stainless steel, it includes two leak-proof lids—a chug lid and a straw lid—offering versatile, sweat-free hydration for active professionals. Designed to fit most cup holders and backpacks, it’s the perfect eco-friendly companion for daily commutes, workouts, and outdoor adventures.




| ASIN | B00JEZ20GO |
| Best Sellers Rank | #150,999 in Kitchen ( See Top 100 in Kitchen ) #1,127 in Insulated Cups & Mugs #2,302 in Insulated Bottles |
| Brand | ThermoFlask |
| Capacity | 40 Fluid Ounces |
| Color | Cobalt |
| Customer Reviews | 4.7 4.7 out of 5 stars (51,443) |
| Date First Available | 31 July 2018 |
| Item Weight | 522 g |
| Material | Stainless Steel |
| Model Number | 50064 |
| Product Dimensions | 11.68 x 9.65 x 35.56 cm; 521.63 g |
| Special Features | Double Wall, Leakproof, Sweatproof, Vacuum Insulation |
A**A
You must buy if you are looking for great partners for your daughter in school
Great for school day. Every great item. It comes with spare straws and another lids for replacement.
S**H
Keeps drink cold for longtime
Keeps water cold for long time even when i keep it in the hot car for 6 hours
F**D
Quality stuff
The bottle was as described and delivered before the promised time .
M**T
The perfect water bottle!
Water stays cold for long... very high quality product..
V**I
Missing lid
Received my order last week the quality is amazing but they did not include the 2nd lid which I personally prefer. They have easily refunded my money back and I am ordering once again hoping I receive the 2nd lid this time.
E**Y
I'm really impressed with this water bottle. I haven't used it for warm drinks yet, but it's kept my water ice cold all day, just like it promises. It's so hard to find a quality water bottle with a straw top, but this one is excellent, well worth the cost. It comes with 2 lids (the chug one and the straw attachment one) and 2 straws.
A**R
perfect durability and i love the color too. Identical to image and bought a lot of these water bottles! They are always worth the price and hold a lot.
B**S
It works great. I went with the 40z to avoid having to refill often. 4 large ice cubes keeps the water cold for about 6-8 hours. Ice cubes left in it empty overnight are still frozen by morning. It's not the most extreme insulation on the market but it's a good compromise with being thinner/lighter which makes it perfect for daily use, filled once or twice throughout the day. A real upside to this design is the 2 tops it comes with. Both are high quality and clever design, unlike many cheaper canteens for sale. The straw spout is fully capped with a softer material that's nice to drink from. But most useful is the handle design. You can comfortably drink and carry from the narrower cap, even when it's completely full, without having to ever touch the wider body. So you've got great control over the bottle no matter what you're doing. It also gives you leverage to open and tighten and the cap so there's never any leaks. This is perfect for people with smaller hands, though the keyhole shaped handle will fit any size hands. It's VERY clever and much more functional than the pivoting strap design on most other canteens. The caps were the big reason I chose this over others and it really does make a difference when I use it every day. It's the main reason I want to leave a review, since some designer made a pretty noticeable improvement with that clever trick. For someone else that complained about the noise, the straw has a pretty high flow rate which is usually nice. To avoid any noise you just have to drink more slowly, like you're sipping through a regular straw. But the second included cap is general purpose, and has a latch mark on the swing-back cap so it won't flop forward while you're drinking or pouring.
S**H
Kid approved! Holding up well for our rough and clumsy 8 year old!
M**R
I searched a lot for a good water bottle with reasonable price. This checks all the marks and the quality is excellent. Definitely recommended.
Trustpilot
2 months ago
2 days ago