What Size Straw Fits a 40oz Tumbler?
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Lost the straw from your 40oz tumbler, or snapped one in a hot wash? Before you buy a replacement, it helps to know what size you actually need — because a straw that's too short or too thin turns a great tumbler into a frustrating one. Here's the simple guide.
The length you need
A 40oz tumbler is tall — around 20cm to the rim — so the straw has to reach the bottom and still stand proud of the lid. For most 40oz tumblers, that means a straw between 26cm and 30cm long. Any shorter and you'll be tipping the cup back to reach the last third of your drink; any longer and it sticks out awkwardly.
The diameter that matters
Length gets the attention, but diameter is what makes a straw feel right. Too thin and thick drinks or ice-cold water are hard work; too wide and it won't seat properly in the lid hole. Most 40oz tumbler straws sit around 10mm, wide enough for an easy sip and to clear small bits of ice.
Why the wrong straw ruins a good tumbler
A straw that's a touch too short means the last few sips are a chore. One that's too loose in the lid rattles and lets air in. And a flimsy plastic straw warps in the dishwasher and ends up in the bin within weeks. Getting the size right — and choosing a material that lasts — is the difference between a tumbler you love and one you quietly stop using.
The easy replacement
Rather than measure and guess, use straws made to fit. Our stainless steel replacement straws are sized for 40oz tumblers — including Stanley Cup 40oz and every Mato London tumbler — and come with a cleaning brush and storage pouch, for £7.99 with free UK delivery. Buy a spare and your tumbler outlives the straw every time.
Related reading
- How to Clean Reusable Metal Straws (So They Never Smell)
- Stainless Steel vs Silicone vs Plastic Straws: Which Is Best?
- Why Does My Tumbler Straw Smell? (And How to Fix It)
- Are Metal Straws Safe and Worth It?
Frequently asked questions
How long is a 40oz tumbler straw?
Usually between 26cm and 30cm — long enough to reach the bottom of the tall cup and stand above the lid.
What diameter straw fits a 40oz tumbler?
Around 10mm is standard — wide enough for an easy sip and to clear small ice, while still seating securely in the lid.
Will Stanley straws fit a Mato London tumbler?
Yes. Our replacement straws are made to fit both Stanley Cup 40oz and Mato London tumblers.
Can I cut a straw to fit?
You can trim a metal straw with the right tool, but it's easier and safer to buy one already sized for a 40oz tumbler.