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  • Brompton Borough Waterproof Large (4573106831411)
  • Brompton Borough Waterproof Large (4573106831411)
  • Brompton Borough Waterproof Large (4573106831411)





We currently have 1 in stock.

The Brompton Borough Waterproof Bag - Large is a robust companion that protects your things come hell and high water. Modelled after the Borough Roll-Top, it has a slightly smaller capacity but the huge added benefit of 100% waterproofing thanks to Radio-Frequency welded construction in place of traditional stitching.

A large messenger style bag with a roomy 25L capacity, the Borough Waterproof has a large main compartment lined with orange nylon to make it easy to locate essentials quickly. A padded laptop sleeve and zippered mesh internal pocket keep things organized, while the two roll-top pockets on the rear of the bag offer space for water bottles or wet gear. The roll top closure with squeeze-buckle closures keeps water out while allowing for flexibility when you need to carry a little extra, and the twist-valve expels air during compression for a compact svelte look. The aluminum slide clip connected to webbing on the front allows you to strap a helmet or raincoat to the outside of the bag. A reflective 3M patch on the front provides visibility on dark nights or in stormy commutes.

  • Genuine Brompton Accessories
  • Brompton Borough Waterproof - Large
  • Roll top provides tons of internal storage space, plus a little extra room if needed
  • Constructed using Radio Frequency Welding instead of stitching for 100% waterproofing
  • Laptop sleeve, internal pocket, and 2 roll-top pockets for bottles or quick-grab items
  • Padded nylon shoulder strap helps you carry heavy loads comfortably off the bike
  • Squeeze buckle closure keeps your things dry and secure
  • Front straps secure helmet or coat to front of bag during transport
  • Reflective 3M patch for nighttime visibility
  • 25 Litre Capacity
  • Front Mounts only on the Brompton Carrier Block (FCB) - Not Included
  • Compatible with all handlebar types
SKU 9023776

600D TPU coated polyester with RF Welded construction (100% waterproof)

DIMENSIONS 30cm X 43cm X 18 cm

Roll Top with squeeze-buckle closures

Twist-valve for air expulsion  

POCKETS 25L main compartment, internal mesh pocket
LAPTOP SLEEVE Integrated padded sleeve in main compartment

Detachable shoulder strap with mesh pad 

Webbing Carry Handle

MOUNTING Removable Support Frame (FCF), Front Mounted Only on Brompton Carrier Block (FCB) - Not Included
COMPATIBILITY Low, Mid, and High Handlebars
A BIT ABOUT BROMPTON: If you were to walk into the store and look at a Brompton we would say there are three things you should look for in a folding bike. All of them are fairly obvious. One, the bike should ride well - and, on a small wheeled bike that's tricky because there's a fine line between maneuverability (which is a virtue) and twitchiness (which is a vice). Two, the bike should fold well - otherwise you're blood pressure will rise and you'll curse the day you bought it. Third, it should be transportable, or highly storable - because that's the whole point, right?

Brompton is the only company we've seen that answers all three criteria - and believe us, we've tried every brand out there. The reason others can't compete is because Brompton has answered a fundamental engineering problem. If a bike is going to unfold to a large footprint (which takes the twitch out) then it is unfolding to a bigger bike - and by all logic, a bigger bike unfolded would be a bigger bike folded. So, it's pretty much true that for most folding bikes they either have great rideability but poor transportability or vice versa. And nearly all of them are a mess to fold.

Not Brompton. Brompton has designed the Platonic form of all folding bikes. The bike folds to the smallest size on the market, unfolds in a highly precise and easy manner, and has the same axle-to-axle footprint as a hybrid bike. How did they do this? By not only designing a clever frame, but also designing some 1200 proprietary parts that make everything fit - and fit perfectly. Oh, and nearly all of this is made in England. No wonder this bike has a cult following.


Canada: We use UPS, Purolator, Canpar or Canada Post within Canada. All applicable Provincial Taxes are charged at checkout. Orders may take 1-2 business days to process. A tracking number will be provided by email.

USA: We use UPS or Canada Post/USPS in the USA. No US or Canadian Tax is charged at checkout and all cross-border Fees and Duties are prepaid so there are no surprises. Orders may take 1-2 business days to process. A tracking number will be provided by email.

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