Hi Im thinking of adding a carry bag to my bromptom do they make bike feel heavy on ride with weight on front of bike?
As
@shouldbeinbed states, carrying a bag on the front of a Brompton actually makes it more stable and less twitchy. Of course it doesn't help the aerodynamics and extra weight makes itself felt like on any other bicycle.
Brompton Bags are great but pricey.
An attachment/rack to carry a pair of regular panniers on the front is also available.
The larger Brompton bags all use a separate frame to fix to the front block.
This can be purchased for ~£20 and used (with a bit of imagination) to mount all kinds of other bags.
https://www.google.co.uk/search?q=b...oTCJb_2fXt7cgCFUvaGgodPZACPg&biw=1366&bih=643
There is a smaller one for S-types and a larger frames for M-types and P-types I've used it for hanging regular Carradice style bags (because I had some) using heavy duty tie-wraps and it works really well.
@User used the same frame for attaching a cheap single pannier from Planet-X and I've done the same and this also works well.
Here is the Brompton loaded for a camping trip using an old Carradice Camper longflap bag on an S-type bag frame:
Here is the Adrian single pannier solution using the same frame: