FWIW, I remove the chain and detach the RD from the dropout when packing up the bike. The Aerus case includes a padded bag to stick the RD into that velcros to a seat stay leaving the cable connected. You can leave the chain on, but I find it easier/tidier to use a quick-link and stick the chain in a baggie. I also put a baggie over the cassette on the rear wheel and wipe off the chain ring with a rag.