The original Ocean Bottle Brew Flask set a high standard for reusable coffee cups: compact, leak-proof, easy to clean and comfortable to drink from.
Peak Brew takes that idea and makes it more capable.
Capacity increases from 350ml to 590ml. Published heat retention rises from six hours to nine. The body has been reinforced, the base is protected by durable rubber and the taller, slimmer shape has been designed to fit a car cup holder.
The result is less like a conventional takeaway cup and more like a proper insulated flask without losing the comfortable, drink-from-any-angle lid that made the Brew Flask so useful in the first place.
The original Brew Flask remains a very good compact reusable coffee flask. Peak Brew is the better choice when capacity, heat retention and durability matter more than carrying the smallest possible cup.
| Feature | Ocean Bottle Peak Brew | Ocean Bottle Brew Flask |
|---|---|---|
| Capacity | 590ml | 350ml |
| Published heat retention | Up to 9 hours | Up to 6 hours |
| Published cold retention | Not specified by Ocean Bottle | Up to 18 hours |
| Drinking lid | Lockable 360° sip lid | Lockable 360° sip lid |
| Leak-proof | Yes | Yes |
| Dimensions | 7.6 × 23.4cm | 6.8 × 16.8cm |
| Empty weight | 409g | 226g |
| Car cup-holder friendly | Yes | Fits most cup holders |
| Construction | Reinforced body and rubber base | Compact stainless-steel body |
| Best for | Long commutes, travel and outdoor days | Everyday coffee and lighter carrying |
The original Brew Flask was recognised with an iF Design Award in 2025. Peak Brew is part of the Peak collection that received a Red Dot Design Award in 2026. Choose Peak Brew if:
Neither is automatically better for everyone. Peak Brew offers more capacity and performance, while the original Brew Flask remains the neater choice for shorter journeys and smaller drinks.
Below is our Shipping Policy; you can also find answers to frequent questions on our FAQ page.
United Kingdom Shipping
Orders placed before noon Monday to Friday will ship the same day.
Orders placed after noon Monday to Friday will ship the next working day.
Orders placed at the weekends will be shipped on a Monday.
Orders are delivered Monday-Friday.
Orders Under £35
When your order is less than £35, we charge £3.50 for standard UK delivery.
Orders £35 or more
When your order exceeds £35, you qualify for free standard UK Shipping at checkout. If the order is placed before noon, your package will be sent that day, and we will always try to have it with you within three working days. If the order is placed after noon, it will be sent the next working day.
If you have any further questions please check out our FAQ page.
Many reusable coffee cups work well on a desk but become less convincing when placed inside a bag.
Some have open sipping lids. Others rely on small sliders that can leak, trap residue or become awkward to clean. Compact cups can also leave you short of coffee during a long commute or full day away from home.
Peak Brew is designed to solve those practical problems.
At 590ml, Peak Brew provides considerably more capacity than Ocean Bottle’s 350ml Brew Flask.
That makes it better suited to:
Built For the Real World
Lockable 360° drinking lid – drink comfortably from any side, then twist closed before placing it in your bag.
100% leak-proof design – the inverted thread tightens as internal pressure increases, helping keep the flask securely sealed while travelling.
Keeps drinks hot for up to 9 hours – improved insulation and an insulating air pocket make it well suited to cold starts, long commutes and outdoor days.
Easy to clean and made to last – dishwasher safe, dual-opening for better access, and backed by Ocean Bottle’s 10-year warranty.
Capacity: 590ml
Material: Made using 90% recycled stainless steel
Insulation: Insulated stainless-steel construction
Heat retention: Up to 9 hours
Lid: Lockable 360° drinking lid
Leak-proof: Yes
Dimensions: 7.6 × 23.4cm
Empty weight: 409g
Base: Protective rubber base
Cup-holder friendly: Yes
Cleaning: Dishwasher safe and suitable for hand washing
BPA free: Yes
App connectivity: Embedded NFC chip
Warranty: 10 years
Environmental impact: Funds collection of 11.4kg of ocean-bound plastic
Every Ocean Bottle funds the collection of 11.4kg of ocean-bound plastic before it reaches the sea. That's roughly 1'000 single-use plastic bottles removed from vulnerable coastal areas.
Ocean Bottle works with local collectors around the world, creating both environmental impact and economic opportunity.
To date, Ocean Bottle has funded the collection of over 2 billion plastic bottles globally, one of the most measurable impacts in the reusable bottle space.
We're not sure where to start with this one, to see it is to believe it.
Ocean Bottle has taken everything that made the original Brew Flask great and developed it into a larger, more capable flask. We didn't think that was possible.
The lockable 360° lid still provides one of the best drinking experiences we have found, allowing you to sip naturally from any side before sealing it securely.
Improved insulation keeps drinks hot for up to nine hours, while the slim profile remains comfortable to hold and fits neatly into most cup holders or bag sleeves.
Add the reinforced body, protective rubber base, excellent colour range and ten-year warranty, and Peak Brew secures it's place as the premium everyday flask.
Most importantly, Ocean Bottle has improved the performance without losing sight of its environmental purpose.
It is made using 90% recycled stainless steel, designed for a long working life, and every purchase funds the collection of 11.4kg of ocean-bound plastic.
Peak Brew has a 590ml capacity. This is considerably larger than the 350ml original Brew Flask and is intended for longer commutes, travel and Iced coffees or matcha lattes.
Ocean Bottle states that Peak Brew keeps drinks hot for up to nine hours. Actual performance can vary depending on the starting temperature, how full the flask is, how often it is opened and the surrounding conditions.
It's design is constructed around hygiene. Being stainless steel (both the straw and the bottle body) means it can be easily cleaned. The lid is a modular design to allow you to clean it throughly.
Yes. Peak Brew has a fully lockable, leak-proof lid and is intended to be carried safely inside a bag when correctly closed.
As with any sealed drinks container, always check that the lid is properly fitted and locked before packing it.
Yes. Peak Brew is dishwasher safe and its dual-opening construction also makes it easier to wash thoroughly by hand.
We recommend keeping the temperature down when using hte top washer, and keeping the lid sections in the top rack.
Ocean Bottle states that the slimmer, taller Peak Brew design is car cup-holder friendly. Its body measures approximately 7.6cm wide.
Cup-holder dimensions vary, so it is worth checking particularly narrow or unusually shaped holders.
Once unlocked, you can drink from any point around the lid’s circular rim. You do not need to find or align a particular drinking hole. Genius really.
The lid can then be twisted back into its locked position before the flask is stored.
Peak Brew holds 590ml rather than 350ml, keeps drinks hot for up to nine rather than six hours and has a reinforced body with a protective rubber base.
The original Brew Flask is smaller and lighter. Peak Brew is better suited to longer days and iced coffees/teas, while Brew Flask remains useful for ordinary-sized coffees and shorter commutes.
Peak Brew forms part of the Ocean Bottle Peak collection, which received a Red Dot Design Award in 2026 in the Outdoor and Camping Equipment category.
