Which Dahon bag do you have? I was and remain somewhat tempted by this Dahon rucksack. Unsure how long it'll last lugging around my 22.4kg bike with battery. With the handbag style El Bolso bag pictured above, at least I can carry the battery separately in my rucksack, along with helmet and other stuff... but I could get a compact folding holdall for all that.Looks just like a big handbag to me, nobody will bat an eyelid.
Dahon BackPack Carry Bag
If the journey is a bit longer… This practical bag allows you to carry your Dahon on your back!
foldingbike.biz