Side panniers allow you to carry more gear without having to install a frame bag or bar bag You can use our Tailfin side panniers (our range will grow in the coming years) or buy the boosters (in development) to carry other brands of panniers If yes, the X Series racks or the AeroPack X will be the right choice for you. If no, the S Series racks or the AeroPack S will be the right choice for you.