• I have one of these you can borrow. The bottom is hard and the bag folds up pretty small, but maybe not small enough to carry on your back and ride.

    That's what I've been using lately. Fits 2 bikes, barely. It does roll up and you can use the handles as rucksack straps but it's not very nice to ride with.
    For Berlin, Roxy and I are going the laundry bags route since we're traveling seperately. Hopefully we can find some thick cardboard to help support the sides a bit.

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