You’re standing at the counter in Pret, watching the barista pour your flat white into yet another paper cup. You know there’s a 25p discount for bringing your own. You know you should. But the reusable cup you bought six months ago is sitting on your kitchen counter with yesterday’s coffee still in it, because the lid was impossible to clean and it leaked in your bag that one time. Sound familiar? The right reusable cup solves all of this — you just need to pick one that actually works for how you drink coffee.
In This Article
- Best Overall: The KeepCup Brew
- How to Choose a Reusable Coffee Cup
- Best Reusable Coffee Cups Tested
- Glass vs Stainless Steel vs Bamboo vs Silicone
- Size Guide: What Fits Your Drink
- Keeping Your Cup Clean
- The Environmental Case for Reusable Cups
- Where to Buy in the UK
- Frequently Asked Questions
Best Overall: The KeepCup Brew
If you want one recommendation and nothing else, get the KeepCup Brew in the 12oz size (about £22-25 from John Lewis or direct from KeepCup). It’s tempered glass with a cork band, fits in your hand properly, the lid clicks on securely, and baristas recognise it instantly — which means less faffing at the counter. I’ve been using mine daily for about eighteen months and the glass still looks brand new. The cork band means no silicone sleeve sliding around, and the whole thing goes in the dishwasher.
It’s not insulated — your coffee will cool faster than in a vacuum flask. But for the walk-to-the-office or drink-in-the-car scenario, that’s rarely a problem. If you need hours of heat retention, skip ahead to the Chilly’s or Frank Green options below.
How to Choose a Reusable Coffee Cup
Before diving into specific cups, these are the things that actually matter:
Material
This is the biggest decision. Each material has trade-offs:
- Glass — best taste (truly neutral), looks great, heavy, can break. Best for: people who mostly drink at their desk or in the car
- Stainless steel — lightweight, virtually indestructible, keeps drinks hot for hours. Some people detect a slight metallic taste with cheaper options. Best for: commuters and anyone who drops things
- Bamboo fibre — looks nice, lightweight, but can absorb flavours over time and often isn’t fully dishwasher-safe. Durability is mixed. Best for: eco-conscious buyers who want a natural look
- Silicone (collapsible) — folds flat for bags and pockets. Clever design, but silicone can retain odours and the drinking experience isn’t as satisfying. Best for: people who need a cup they can forget is in their bag
Lid Design
This is where most reusable cups fail. The lid needs to:
- Seal properly — no leaks in your bag. Ever. Test this before trusting it with a laptop in the same bag
- Be easy to drink from — a sip hole that’s too small is annoying, too large and you’ll spill
- Come apart for cleaning — lids with crevices and rubber seals that don’t separate are mould magnets
Size
Coffee shops in the UK use roughly standard sizes:
- 8oz (227ml) — small/regular. Espresso, cortado, small flat white
- 12oz (340ml) — medium/regular. Standard latte, flat white, cappuccino. This is the most versatile size
- 16oz (454ml) — large. Americano, filter coffee, or if you just want a lot of latte
Get the 12oz unless you know you always order a specific size. It fits under most coffee machine group heads too, if you’re making espresso at home with your espresso machine.
Best Reusable Coffee Cups Tested
KeepCup Brew (Glass) — Best Overall
- Price: about £22-25
- Material: tempered glass, cork band, polypropylene lid
- Sizes: 6oz, 8oz, 12oz, 16oz
- Dishwasher safe: yes
- Heat retention: minimal (not insulated)
- Where to buy: John Lewis, Amazon UK, keepcup.com
The Brew is the cup that converted me from paper. The glass is thick enough to feel substantial without being heavy, and the cork band gives proper grip without needing a silicone sleeve. The lid has a simple plug system — pop it open to drink, push it closed for transport. It’s not 100% leak-proof if you chuck it in a bag upside down, but for normal carrying it’s solid.
My only gripe: the 12oz fills right to the brim if you order a medium latte with no room. Ask for “not too full” or get the 16oz if you like big milky drinks.
Chilly’s Series 2 Coffee Cup — Best for Heat Retention
- Price: about £30-35
- Material: double-wall vacuum insulated stainless steel
- Sizes: 340ml, 500ml
- Dishwasher safe: yes (cup body; hand-wash the lid)
- Heat retention: up to 6 hours hot, 12 hours cold
- Where to buy: Chillys.com, John Lewis, Selfridges
Chilly’s nailed the design refresh with Series 2. The flip-top lid feels premium and seals properly — I’ve carried this in a backpack with a laptop and never had a drop escape. The vacuum insulation is the real selling point. Coffee stays genuinely drinkable for 3-4 hours, which is perfect for long train journeys or forgetting about your drink during a meeting.
The trade-off is weight. At 340g empty, it’s noticeably heavier than a KeepCup. And the narrow drinking spout means big sips feel restrictive compared to an open cup. But for heat retention and leak protection, nothing else here comes close.
Frank Green Original Reusable Cup — Best Lid Design
- Price: about £30-35
- Material: stainless steel with push-button lid
- Sizes: 230ml, 295ml, 340ml, 475ml
- Dishwasher safe: yes
- Heat retention: up to 6 hours
- Where to buy: frankgreen.com, Selfridges, Amazon UK
Frank Green’s push-button lid is the cleverest mechanism in this roundup. One press to open the drinking hole, one press to close it. It’s intuitive, it’s properly sealed, and it’s the closest you’ll get to a disposable cup’s ease of use. The wide colour range is a bonus — they’ve leaned hard into the “pick your colour combo” personalisation.
The 340ml size works for most drinks. Build quality is excellent. If I’m being picky, the drinking hole sits at one specific point on the lid (it doesn’t rotate), so you need to hold the cup a certain way. Minor thing, but you notice it the first few times.
Circular&Co Reusable Coffee Cup — Best Eco Credentials
- Price: about £15-18
- Material: recycled single-use paper cups (yes, really)
- Sizes: 227ml, 340ml
- Dishwasher safe: yes
- Heat retention: some insulation (better than glass, not as good as vacuum steel)
- Where to buy: circularandco.com, Amazon UK
Made from six recycled disposable cups. That’s a compelling story, and the cup itself is surprisingly good. It’s lightweight, the twist-lock lid seals well, and it comes in a range of colours. I’ve used one as a desk cup for about four months and it’s held up well — no staining, no weird smells.
It won’t keep your drink hot for hours like the Chilly’s, and the material has a slightly plastic feel compared to glass or steel. But for the price and the environmental angle, it’s excellent. According to WRAP (the Waste and Resources Action Programme), the UK throws away 2.5 billion disposable cups a year — knowing your cup was made from six of them feels like a tangible contribution.
Stojo Collapsible Cup — Best for Portability
- Price: about £14-18
- Material: food-grade silicone, polypropylene lid
- Sizes: 355ml, 470ml
- Dishwasher safe: yes
- Heat retention: none
- Where to buy: Amazon UK, stojo.co
The Stojo collapses to about a third of its full height. That’s its entire party trick, and it’s a good one. When expanded, it’s a perfectly functional cup. When collapsed, it’s a disc that fits in a coat pocket or the front pouch of a laptop bag. No more “I left my cup at home” excuses.
The drinking experience is the weakest here — silicone flexes when you squeeze, the walls aren’t rigid, and it can pick up flavours if you alternate between coffee and tea. It also won’t keep anything warm. But as a backup cup that’s always with you, nothing beats it. I keep one in my work bag permanently for those days I forget the KeepCup.
Glass vs Stainless Steel vs Bamboo vs Silicone
Choosing between materials comes down to what annoys you most:
- Taste matters most? Glass. Nothing else is truly flavour-neutral. Your coffee beans taste exactly as they should. If you’re into pour-over methods, check our Chemex vs V60 vs Kalita Wave comparison
- Heat retention matters most? Stainless steel with vacuum insulation. Nothing else comes close
- Weight and portability matter most? Silicone (collapsible) or bamboo fibre
- Durability matters most? Stainless steel. Drop it from a table onto tiles and it dents at worst. Glass shatters, bamboo cracks, silicone survives but deforms
- Environmental impact matters most? Circular&Co (recycled cups) or KeepCup (B Corp, designed for long life)
What About Ceramic?
A few brands make ceramic reusable cups — essentially travel-friendly versions of your favourite mug. They feel lovely to drink from and look beautiful. But they’re heavy, fragile, and typically more expensive than glass alternatives without meaningful advantages. Unless the aesthetics really matter to you, glass gives you 90% of the ceramic experience with better durability.
Size Guide: What Fits Your Drink
Getting the wrong size is the most common mistake. Here’s a practical guide:
- Espresso or cortado — 6oz or 8oz cup. Anything larger and your drink looks lost
- Flat white — 8oz is traditional, 12oz gives the barista room to work
- Latte or cappuccino — 12oz minimum. A 16oz is better if you like a larger milk-to-espresso ratio
- Americano or filter — 12oz or 16oz depending on how much you drink
- Iced coffee — always go bigger than you think. Ice takes up space. 16oz minimum
Will It Fit Your Machine?
If you’re using your reusable cup at home under an espresso machine, check the clearance between the drip tray and the group head. Many home machines have only 8-10cm of clearance, which rules out taller cups. The KeepCup 8oz and Frank Green 230ml both fit under most domestic machines. The taller Chilly’s and 16oz cups generally don’t.
Keeping Your Cup Clean
A clean cup is a cup you’ll actually use. Stained, smelly cups get abandoned on kitchen shelves.
Daily Cleaning
- Rinse immediately after drinking — don’t let coffee dry inside. This prevents 90% of staining
- Dishwasher if the manufacturer says it’s safe (most are). Top rack, away from direct heating elements
- Hand wash with warm water and washing-up liquid if no dishwasher available
Deep Cleaning (Monthly)
- Baking soda paste — mix two tablespoons of bicarbonate of soda with a little water, scrub inside with a bottle brush, leave for 30 minutes, rinse. Removes stains and odours
- White vinegar soak — fill with equal parts white vinegar and water, leave for 2-3 hours, rinse thoroughly. Cuts through coffee oils and calcium deposits
- Silicone lids and seals — remove and soak separately. These are where mould hides. Check crevices
Avoiding Common Problems
- Coffee stains on glass — bicarbonate of soda fixes this in minutes
- Silicone smelling of old coffee — soak in white vinegar overnight
- Lid seal going stiff — food-grade silicone grease on rubber seals every few months keeps them flexible
- Metallic taste from steel cups — usually means the inner coating has been damaged by abrasive scrubbing. Use non-scratch sponges only
The Environmental Case for Reusable Cups
The environmental argument is simple: most disposable coffee cups aren’t recyclable through standard UK council collections. The polyethylene lining that keeps them waterproof means they need specialist facilities, and according to WRAP, only about 1 in 400 disposable cups in the UK gets recycled. The rest go to landfill or incineration.
A reusable cup needs to be used a certain number of times to offset its manufacturing footprint. For a stainless steel cup, that’s roughly 50-100 uses. For a glass cup, about 15-20 uses. A silicone cup sits somewhere in between. If you’re buying coffee three times a week, even a steel cup pays back its environmental cost within six months.
The financial case is simpler: most UK coffee chains offer a 25p-50p discount for bringing your own cup. At three coffees a week with a 25p saving, that’s £39 a year — easily covering the cost of any cup on this list.
Where to Buy in the UK
- John Lewis — stocks KeepCup, Chilly’s, and Frank Green. Good for seeing them in person before committing
- Amazon UK — widest range, fastest delivery, but harder to verify you’re getting genuine products
- Brand websites — KeepCup, Chilly’s, Frank Green, Circular&Co, and Stojo all sell direct with full warranty
- Selfridges — premium range including limited editions and colour exclusives
- TK Maxx — surprisingly good for discounted KeepCups and Frank Green cups. Stock is hit-and-miss but prices are typically 30-40% lower
For most people, ordering direct from the brand or grabbing one from John Lewis is the easiest route. You’ll get the full colour range and proper warranty support.
Frequently Asked Questions
Do baristas actually accept reusable cups? Yes. All major UK chains — Pret, Costa, Starbucks, Caffe Nero, and most independents — accept reusable cups. Since COVID restrictions lifted, there’s been no issue. Most baristas prefer them because they’re sturdier than paper cups and easier to work with. The only exception is some drive-throughs, which occasionally refuse for hygiene policy reasons.
Which reusable coffee cup keeps drinks hottest? Vacuum-insulated stainless steel cups like the Chilly’s Series 2 and Frank Green keep coffee hot for 4-6 hours in practice. Glass and silicone cups have almost no insulation — your drink will cool to room temperature within 30-45 minutes, similar to a disposable paper cup.
Are reusable coffee cups dishwasher safe? Most are — including all five cups reviewed here. However, some lids with silicone seals are hand-wash only, so always check the manufacturer’s guidance. The cup body is almost always dishwasher safe regardless of material.
How often should I replace my reusable coffee cup? A good glass or stainless steel cup should last years — five or more with proper care. Replace sooner if the lid seal no longer seals properly, if a glass cup is chipped, or if a silicone cup has developed permanent odours that cleaning can’t remove. The lid usually wears out before the cup itself.
Can I use a reusable cup for tea as well as coffee? Of course. Glass and stainless steel work equally well for both. The only issue is flavour transfer — silicone cups can carry coffee flavour into your tea if not cleaned thoroughly between drinks. A quick rinse with bicarbonate of soda solves this.