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Ozonation 07-09-12 09:50 PM

Bag for rear rack of Brompton?
Does anybody know of a third party bag or DIY bag that can be attached to the rear of the Brompton? I was riding to work with a small bag strapped in at the back rack (my Brompton bag upfront was full), but the clearance between my heal and the strapped bag was so tight, I could barely peddle.

So, I think I need a tall, skinny bag that can be anchored to the rear rack itself, and ideally, can be converted into a messenger style or at least shoulder type bag when not in use on the bike itself.

Any suggestions other than the rear rack bag that Brompton promotes? Thanks in advance...

alhedges 07-09-12 11:02 PM

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My first thought would be to see if you could avoid heel strike with the existing bag. What works for me is to mount a bag transversely on the rack, and then attach the bungies not to the "ears" where they are usually attached, but to the front of the rack itself. I usually put both bungie hooks in the center "box"* at the front of the rack; there's just room for both hooks. At least for me, this keeps the bag back far enough that I don't have heelstrike issues...this works well (for me) even with a folded B-Bag, which is not a small bag.

*If you look at the rack from the top, it consists of four longitudinal metal ribs. At the front of the rack, the two center ribs continue past the edge of the rack and form a 1" x 1" downward sloping "box" - I think it is there to protect the rear brakes. Anyway, this is where I attach the bungies.

I have a couple of carradice saddlebags that I sometimes use with the B. They attach to the saddle so you shouldn't have heel strike issues at all. They also have the advantage that you can park or even fold the bike without having to take them off. They have the disadvantage that it takes a minute or so to take them off the bike and aren't that easy to carry.

Here's a picture from Carradice's website:

On a B, the bags are well above the rear rack.

EM42 07-10-12 01:34 AM

some information from this video/website might help avid brompton travelers

they use ordinary backpack attached on the rear rack

they have lots of info/photos on their website

here's an example video

Ozonation 07-10-12 08:05 AM

Huh... thanks for the reference to the Path Less Pedaled. Neat idea - by keeping the backpack towards the rear and upright, you can get the heel clearance while pedaling. If I was going on an extended trip, I'd probably do something similar - actually, I'm not sure I can as between me and a pack similarly loaded I'm pretty sure I'd be much heavier than the Brompton is rated for!

I'm looking for more of a short trip, in-and-out solution, like when you have that extra "thing" you need to bring to and from work or the store. However, if I can get the bag elevated a bit - maybe with a riser (heck, even a skinny cardboard box would work) - then I can get the clearance and not worry too much about the bag itself.

fietsbob 07-10-12 09:50 AM

small rack top bags also use it's velcro on the side rails..of that rack too..

But, a Beam rack off the seatpost with the bag on it,
would still let you use the empty rear rack, fold under, as the prop stand ..

there are expanding 'spaniel ear' bags that will drape over the sides
to use then.. rack has side supports..

my Touring Front bag is the Messenger sized bag..
Un rolled it will top load with a lot, a toe strap thru the handle,
around the steering mast , supports extra weight well .

MadCityCyclist 07-10-12 09:19 PM

Brompton has a proprietary rear rack bag that you've probably already seen.

An easily found DIY-type solution would be to use a reusable grocery bag, because they tend to be tall & thin. The trick would be to figure out a way to attach it to the seat post like the proprietary bag does; all you need to do is use the rack's built in bungee cords and run those through the bag's handles and hook them onto the seat instead of the rollers at the front of the rack...tying the bag's handles in a knot before running the bungee cords through them will help, as will proper placement of the bag so that it is parallel with the rack & direction of the bike as opposed to being perpendicular.

Please note the conditions where I ride are quite favorable, mostly paved bike paths for 3 miles each way. Additionally, this particular method doesn't hold the bag down onto the rack itself, I let gravity do that and the terrain normally doesn't cause a problem in that regard.

I'm not a normal-sized guy thanks to weightlifting and I have to get some clothes custom-tailored. You could probably do the same thing for a reusable grocery bag with velcro straps that would secure the bag to both the rear rack and the seat post. It wouldn't be a complicated assignment and it's a buyer's market as far as tailoring is concerned.

Ozonation 07-11-12 07:20 AM


Originally Posted by MadCityCyclist (Post 14465102)
An easily found DIY-type solution would be to use a reusable grocery bag, because they tend to be tall & thin.

Thanks. I was thinking of something like that. I was wondering how I could stiffen the sides of the bag a bit so the contents wouldn't bulge out the sides when compressed by the cords. Maybe some corrugated plastic inserts or something...

MadCityCyclist 07-11-12 09:38 PM


Thanks. I was thinking of something like that. I was wondering how I could stiffen the sides of the bag a bit so the contents wouldn't bulge out the sides when compressed by the cords. Maybe some corrugated plastic inserts or something...
Here's something I used on the panniers of my trekking bike, which are big Axiom Champlains. The problem was it was a lot of pannier, and there was so much fabric that the panniers started curling inwards toward the rear tire's spokes, on both sides. I also didn't like the saggy way they looked. I bought some dowel rods from Home Depot and made them into a frame that went inside the panniers.

The frames were like a 3-D rectangle. I used twine to tie the corner joints together and then finished them off with some Gorilla tape. That was two years ago, and they still work like a charm. You could try something like that, but honestly, something like a 5 gallon Jerry can with the top cut off might work better, but it wouldn't be as cheap.

You could also look on ebay for ammo cans. Some of them look like they would be the right size (plus they are usually waterproof). If it's modern surplus and not war memorabilia, they should be fairly cheap as well.

bdi121 07-14-12 09:13 PM

I carry dry sacks/bags and hang them on the handle bar, the S-bag or the saddle. Anywhere you can clip things on and the sacks are quite strong. You can find them at the local camping stores. When not in use , I roll them flat and clip into a flat ring and store in my S-bag for the next unexpected use.

Dry sacks don't interfere with the fold . I'm thinking about removing the Brompton rear rack - hardly use it at all.

bhkyte 07-17-12 12:11 PM

Any one ever used the Mezzo bag on a brommie.

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