Very roomy and solid.Loads of seperate space for organising things. Attaches easily, I like the simple click mechanism on and off.

Sold by Brompton Bicycle
The information on this page is based solely on product reviews written by customers of Brompton Bicycle via Trustpilot.
Here’s what people highlighted
Product details
Brand: Brompton
MPN: Brompton Borough Waterproof Bag Large in Navy
All reviews
Great quality although not sure I would have bought this bag if it was not offered free with my bike purchase. I will be buying the smaller 9 litre bag for day to day use. This bag will be ideal when away in the van for shopping.
Great quality bag ideal for all you could need on and off the bike. Quite expensive but you are paying for the design and ease of use putting on and off the bike also the brand name has a higher price tag but you do get what you pay for and I’m happy with the purchase
Brilliant bag and designed just perfectly.
Brilliant bag.
A top quality bag which goes well with the bike and is practical.
Perfect for my work stuff, gear and very easy to use.
This time I was looking for a bike bag that was completely waterproof. And I found it! Not a drop of water gets through, even in the heaviest downpour (or: even in the strongest storm)!
Pretty much perfect for my use case, shop runs and the like, plenty of non-compartmentalised storage volume. If you want to use the internal zip pocket pay attention to the dimensions, you're not going to fit more than a slimline MacBook, much more feasible to use it for maybe documents, a wallet or some other small accoutrements. If you tuck the shoulder sling through the carry handleand then pin it down with the front hook strap you can avoid having to remove the strap when you slot it onto your bike, which I've seen some people gripe about, never a problem for me. Good bag overall, if you take those caveats.
The bag material is good and the connection to the front mount block is very convenient. That said, The bag is priced pretty high for what it is. Vincita offers more well thought out products for a fraction of the price. Bag Review Details: 1) The rollup top is great for waterproofing but very inconvenient for daily use (it also makes the bag pretty awkward looking when not stuffed to the brim. 2) The pouches on the back look as though they should disconnect and serve as smaller bags on their own. They don't... which is a huge opportunity miss. 3) The bag in general doesn't work well as any sort of bag when off the bike. If you've got money to blow and are looking for a Brompton branded waterproof bag for the occasional rainy commute, then this bag will do just fine. Brompton's customer pays return shipping policy has left me with this brand-new bag that'll never be used :/ waste of money for my use case.
On the photos it seemed maybe a bit too large. In reality it is large, but not excessively. One can fit a lot of stuff inside! Perfect for shopping. I was a bit sceptical about the two back pockets, however I use them daily to push small items inside. It is good that they are very tall and nothing can fall out even if they are not properly closed.
Bag is huge. Eye watering expensive. Quality has been reduced. Clip system poor.Not as good as the bag it replaces which just wore out after intensive use. This will not last as long. You do get caught in the Brompton myth. There are no alternatives really. Brompton should and could do better.
The bike and accessories have and are great
Bigger than I expected, great for groceries, but not very well designed for prolong usage off the bicycle. It's definitely made to be mounted and carried home, but so far is also working as a book bag for work and university
Dear Mr Brompton, With all due respect, why can't you do thing properly ? With the price I paid, I expect perfection ! Look at this plastic stuff, miserable ! look cheap , like a MadeInChina cheap toy. Actually same apply with my bike, I was surprised , looking at the bottom bracket, cheap plastic again, again look like a cheap supermarket bicycle for kids. Out of curiousity, I dismantelled the plastic thing that carry the bag, sorry forgot taking a picture. Inside , really look cheap stuff , kinda kid toy ... However, the bag itself is ok look good quality (for the price, normal ) and outmost, it is stable on my bike
I’ve only had it for a short time! But it allows me to do my shopping and fit sooo much in doesn’t even weigh me anything so I can back from the shops with no where near as exhausted as I used to. By the way I love how you can fold the bike then remount the bag and it serves as a shopping trolley!
Ample space for my laptop, change of clothes, toiletries and miscellaneous stuff.
Great product in terms of robustness and waterproof material. Could do with a better carrying handle however, as feels a little too thin. Could do with some padding. Nice to be able to carry over the shoulder by the longer handle however.
