The Astronauts Pack Carrier -our small bicycle seat bag- is now even more flexible. The fastening system was completely seperated from the actual bag. You can install the Carrier more easily to all your bikes. Just get a seperate fastening system for each bike, leave it there and just switch the Carrier between you Mountain- or Citybike. Once you’ve installed the fastening system you can leave it attached and didn’t have to undergo the whole fastening setup. Take a look at the Youtube-Video where the Carrier Seatbag is installed and switches between bikes.