Stanley Cup Straws in the UK: Where to Buy Replacements and What Actually Fits

Straws go missing. They go in the dishwasher and come out warped, get chewed flat, disappear into a car footwell, or get left on a desk at work and never seen again. It's the single most-replaced part of any tumbler — which is why "stanley cup straws" is such a persistently searched term.

The frustration for UK buyers is that most of what Google returns is American. "Near me" surfaces Target and Walmart. Marketplace listings quote dispatch from overseas with a two-to-three-week window and a possible customs charge on a £8 item. That's a bad deal for a consumable.

This guide covers what actually fits, what to avoid, and how to buy in the UK sensibly.

What size straw fits a Stanley Cup 40oz?

The specification most people need:

• Outer diameter: 10mm (about 0.4 inch) is the standard for 40oz tumblers with a lid straw port. Some listings quote 9.5mm, which also fits.
• Length: around 28–30cm. A 40oz stands roughly 30cm with the lid on, so the straw needs to reach the base and still sit proud of the lid.
• Wall type: a straight tube is standard. Angled or bent-tip straws exist but can catch on the lid's straw port.

A 40oz is unusually tall for its capacity, and that's the mistake people make — they buy a generic "metal straw set" that's 21cm, which is the standard length for a pint glass, and it vanishes into the cup. Length is the thing to check first. We've gone into this in more detail in what size straw fits a 40oz tumbler.

Plastic, silicone or stainless steel?

The original-style plastic straw

Cheap and light, and it's what most tumblers ship with. The downsides are real: plastic scratches easily, and scratched plastic holds odour permanently. It also cracks if you chew it, and once cracked it's binned. Most people replace theirs at least twice a year.

Silicone

Soft, chew-friendly, and the sensible choice if you're buying for a child or if you have any dental sensitivity. The trade-off is that silicone is slightly porous and picks up smells faster than any other material. It also collapses if you suck too hard on a thick smoothie.

Stainless steel

The best long-term choice for most adults. It doesn't scratch, doesn't hold flavour, doesn't warp in the dishwasher, and with reasonable care lasts years rather than months. Two genuine caveats: it conducts temperature, so a steel straw in a very hot drink is uncomfortable on the lips — use it for cold drinks and iced coffee. And it's rigid, so it isn't the right pick for young children.

If you want the full comparison including environmental impact, see stainless steel vs silicone vs plastic straws.

What to check before you buy

Four things separate a straw set worth buying from a disappointment:

Does it come with a cleaning brush? A straw without a brush is a straw that will smell within three weeks. Any reputable set includes one. If the listing doesn't mention it, assume it doesn't have one and budget for a separate brush.

Is the grade specified? Look for 18/8 or 304 food-grade stainless steel. Unspecified "stainless steel" on a very cheap listing can mean a lower grade that discolours and can develop a metallic taste.

Are the ends finished? Cheap straws are cut and not deburred, leaving a slightly sharp rim. Run a fingertip round the end when it arrives; if it catches, send it back.

How many are in the set? Buy more than one. Straws are lost, not worn out. A set of two or more means the cup isn't out of action the moment one goes walkabout.

Where UK buyers can actually get them

Realistically there are three routes:

The original brand direct. You'll get an exact-fit part, but availability of accessories in the UK store is patchy and pricing is at a premium. Fine if you want the branded item specifically.

Marketplaces. Cheapest headline price, most variable quality. The main risks are wrong length, unspecified steel grade and long dispatch from overseas. Read the dimensions in the listing, not the title.

A UK drinkware brand that makes compatible parts. This is the middle ground and usually the practical one: correct dimensions, specified materials, brush included, and next-day-ish domestic shipping on a low-value item where postage time matters more than pennies.

What we make

Our stainless steel replacement straws are £7.99 and made to the 10mm / 40oz standard, so they fit Stanley Cup 40oz as well as every Mato London 40oz tumbler. Each set includes a cleaning brush and a carry pouch, and ships from the UK.

We started making them because our own customers kept asking where to buy replacements without ordering from the States. Compatibility was the whole point — it doesn't matter to us whose tumbler you own.

Making a straw last

Three habits, and you'll rarely buy another:

• Brush it, don't just rinse it. Rinsing moves water through the tube; it doesn't touch the biofilm on the inner wall. Thirty seconds with the brush, both directions.
• Dry it standing up. A straw left flat holds a bead of water in the middle indefinitely.
• Keep the spare in the pouch, in your bag. The main cause of straw loss is having only one.

Full method in how to clean reusable metal straws.

Frequently asked questions

Do Mato London straws fit a genuine Stanley Cup 40oz?

Yes. They're made to the same 10mm diameter and 40oz-height standard used by the Stanley Cup 40oz straw port. They also fit most other 40oz tumblers on the UK market.

Are Stanley cup straws dishwasher safe?

Stainless steel straws generally are — top rack, and use a brush anyway, because a dishwasher jet doesn't reliably clean the inside of a 30cm tube. Original plastic straws are more likely to warp at high temperatures; check your specific product.

Why did my new straw not reach the bottom?

Almost certainly a length problem. Generic metal straw sets are usually 21cm, sized for a pint glass. A 40oz tumbler needs roughly 28–30cm. Check the stated length, not the photo.

Can I use a 30oz straw in a 40oz tumbler?

The diameter usually matches, so it will fit the port — but it'll be around 5cm too short, so you'll be tipping the cup to finish a drink. It works in a pinch. It isn't a fix.

Are metal straws bad for your teeth?

They're rigid, so an accidental knock is more jarring than with plastic — the practical advice is not to walk or drive while drinking through one, and to choose silicone for children. There's no evidence of routine damage from normal use. More on this in are metal straws safe and worth it.

How many replacement straws should I buy?

At least two. Straws are almost always lost rather than broken, and having a spare in your bag means you're never drinking a 40oz iced coffee from the rim.

Get a set that actually fits

Mato London stainless steel replacement straws — £7.99, cleaning brush and pouch included, sized for Stanley Cup 40oz and Mato London tumblers, dispatched from the UK.

Buying a tumbler at the same time? The tumbler and straws bundle pairs a 40oz with a straw set for £24.99.

Mato London is an independent UK drinkware brand. We are not affiliated with, endorsed by, or connected to Stanley or PMI. "Stanley" is referenced solely to describe product compatibility.