Why would you want to fold it with panniers attached? I don't think you can fold any bags with panniers attached, not even Brompton. You can attach two panniers, just will need to choose ones suiting rear rack. You can also install front rack or front KLICKfix adaptor (either or). KLICKfix can accommodate different bags compatible with KLICKfix but max weight is 7kg. Front rack is also very useful and doesn't affect the fold.