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Cold for 30 hours. Leakproof for all of them.
$49.90 $24.95 each · save $9.90
Cold for 30 hours. Triple-wall vacuum, not double.
Hot for 12 hours. Most 40oz straw tumblers aren't rated for hot at all.
Locking lid on a silicone gasket — throw it in your bag.
18/8 food-grade stainless inside. Water tastes like water.
Choose your colourway
How many
And your second colourway
Pick your colourways and order.
It ships. Free, tracked.
Use it. Send it back if it isn't right.
The cold test
Same glass. Same clock. Filmed straight through.

Filled to the top.

Barely moved.

Overnight, still cold.

Ice still floating.
Triple-wall vacuum, not double. That's where the extra hours come from.
Proven, not claimed
Turn it upside down. Then shake it.
In a tote, next to a laptop, sealed position. It came out dry — we filmed it rather than writing "100% leakproof" and hoping you would believe it.
Leakproof in sealed position. Spill-resistant with the straw open, like any straw lid.
The problem
Four reasons the last one ended up in a cupboard.

Cold for 30 hours
Triple-wall vacuum, not double.

A lid that locks
Onto a silicone gasket. Not resting on one.

Hot for 12 hours too
Wide mouth when it is properly hot.

18/8 stainless inside
No lining, no coating, nothing to break down.
Cold, warm or properly hot
One lid. Three positions.
Straw
Iced water, iced coffee, anything cold or warm. Most days, this one.
Wide mouth
When it's properly hot — a steel straw conducts heat.
Sealed
Locked. The one you throw in a bag without thinking.
Most 40oz straw tumblers aren't rated for hot drinks at all. That's the difference worth knowing.

What's actually touching your water
18/8 stainless. Nothing else.
The inner wall is food-grade 18/8 stainless — no plastic lining, no coating, nothing that breaks down over a year of dishwasher cycles. It's also why the water tastes like water, and why the vacuum gap can hold cold for 30 hours.
How it compares
Against the category, not against a brand.
Category norms from current retail listings. We don't name competitors.
Most people buy two
Pick two colourways. $49.90.
One stays on the desk with iced water. One lives in the car with coffee. Or one for you and one for the person who keeps borrowing yours — which, going by the reviews, is how most second cups happen.
- $24.95 each instead of $29.90
- Any two colourways, your choice
- Free shipping, same guarantee on both
In the wild
Real cups, real days.
Lifetime guarantee
On the insulated steel body, for as long as you own it.
30-day returns
Use it, wash it, decide. Send it back if it isn't right.
Free Shipping
on every order
Questions
Before you buy.
1. Is it actually leakproof, or just spill-resistant?
Leakproof in the sealed position. The lid locks down onto a silicone gasket rather than resting on one, which is the difference — we filmed it upside down and shaken in a tote bag with a laptop, and it came out dry. With the straw open it is spill-resistant, not sealed, the same as any straw lid. Slide it to sealed before it goes in your bag.
2. Does it really keep drinks cold for 30 hours?
Yes. Triple-wall vacuum insulation rather than the double wall most 40oz tumblers use, which is where the extra hours come from. Fill it with ice the night before and it is still cold at lunch the following day. Hot drinks hold for around 12 hours. Real conditions vary — a cup left in a hot car will not match one on a desk — so we filmed the test with the clock in frame rather than asking you to take our word for it.
3. Will it fit my car cup holder?
The base is 2.9 inches, which fits 99% of car cup holders. It also fits most treadmill holders and the cup holder on a standard stroller handle. Plenty of 40oz tumblers are 3.1 inches or wider at the base, which is the usual reason one does not fit.
4. What is it made of?
The interior and the straw are 18/8 food-grade stainless steel — no plastic lining, no coating, nothing that breaks down over a year of washing. That is also why the water tastes like water rather than like the cup. The lid, handle and outer finish use BPA-free and phthalate-free materials.
5. Will it fit my cup holder?
The 2.9 inch base fits 99% of car and stroller cup holders.
7. How long does shipping take?
Orders are shipped within 1-2 working days, and free on every order with no minimum. Delivery is typically 3–5 working days within the US. You will get a tracking number by email as soon as it leaves.
8. What if I don't like it?
Send it back within 30 days for a refund. Use it properly first — wash it, take it to the gym, put it through a real week. A tumbler you have not actually carried tells you nothing. Email us and we will sort the return. If you ordered from us we can look the order up, so there is no receipt to find.
9. What does the lifetime guarantee cover?
The insulated stainless steel body, for as long as you own it. If it stops holding temperature because the vacuum seal has failed, or there is a defect in the steel or the workmanship, we replace it. Lids, straws and gaskets are covered for 12 months against manufacturing defects. Not covered: drops and impact damage, damage from the bottom rack of a dishwasher, normal wear, scratches and fading, or loss.
10. Why isn't the lid covered for life?
Because lids break when they are dropped, and we cannot tell a manufacturing fault from a hard fall on a tile floor. Guaranteeing one for life would mean either turning down claims we had promised to honour, or pricing the tumbler higher to cover it. Neither seemed fair. What we do instead: 12 months against defects, and if a lid fails early under normal use, get in touch. We would rather sort it out than have you stuck with a cup you cannot use.
6. Is it dishwasher safe?
Top rack, yes for the lid and the bottom rack for the cup body. Keep the lid off the bottom rack — the heating element down there is hot enough to damage the vacuum seal, and that kind of damage is not covered by the guarantee. Hand washing the lid is easier anyway. Pop the gasket out every few weeks and rinse underneath it.
One last thing
Cold for 30 hours. Leakproof for all of them.
Two colourways for $59.90, or one for $34.90. Thirty days to change your mind either way, and a lifetime guarantee on the body if you don't.