If you're flying BA you've got an extra piece of sports equipment so you can check two bags with no extra fee.
I did it with one of these http://www.vincita.co.th/collections/brompton-bags/products/b132b-soft-transport-bag-for-brompton-bike with bike and a load of clothes packed around plus another bag and it was fine.
Plus you can have a hand luggage sized bag and a laptop bag.
@aggi started
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If you're flying BA you've got an extra piece of sports equipment so you can check two bags with no extra fee.
I did it with one of these http://www.vincita.co.th/collections/brompton-bags/products/b132b-soft-transport-bag-for-brompton-bike with bike and a load of clothes packed around plus another bag and it was fine.
Plus you can have a hand luggage sized bag and a laptop bag.