Found a travel bag that comes in a backpack, so that you can arrive, unpack the bike and ride away with the travel bag on your back or hanging from the handlebars. Not a lot of room in the backpack for anything else (but some), so you either travel light or have another bag. There's light padding in the walls of the bag but If you were taking it on a plane you'd want to add some bubblewrap and put clothes around it - it's a slightly roomy fit for most folded bikes so there's space for clothes. I'm going to be trying just that in a few days, so I'll report back.
Given the dimensions of the travel bag (34 * 68 * 85 cm), you could fit some models of medium-sized road bikes in it if you disassembled them and still have room for some clothes.
Isn't perfect but it's a flexible solution, cheap as these things go (£58 on Amazon Prime but as little as £34 from some UK eBay shops).
What/How/When are you using it? I have the Ikea Dimpa bag that I haven't yet tried, but I have vague and distant pipe dreams about being able to fly with a Brompton, including cycling to and from the airports
https://www.flickr.com/photos/itsbruce/sets/72157689467939225/with/36594049903/
Found a travel bag that comes in a backpack, so that you can arrive, unpack the bike and ride away with the travel bag on your back or hanging from the handlebars. Not a lot of room in the backpack for anything else (but some), so you either travel light or have another bag. There's light padding in the walls of the bag but If you were taking it on a plane you'd want to add some bubblewrap and put clothes around it - it's a slightly roomy fit for most folded bikes so there's space for clothes. I'm going to be trying just that in a few days, so I'll report back.
Given the dimensions of the travel bag (34 * 68 * 85 cm), you could fit some models of medium-sized road bikes in it if you disassembled them and still have room for some clothes.
Isn't perfect but it's a flexible solution, cheap as these things go (£58 on Amazon Prime but as little as £34 from some UK eBay shops).