Can I use a saddle bag to carry a spare chain and chain breaker, and if so, what are the potential downsides of doing so, particularly with regards to added weight, aerodynamics, and overall bike handling. How do the constraints of a saddle bag, such as limited space and accessibility, influence the decision to carry a spare chain and chain breaker on a road bike, and are there alternative solutions that provide more practical benefits for riders who prioritize convenience and efficiency. What are the minimum requirements for a saddle bag to effectively carry a spare chain and chain breaker, and are there specific features or designs that make some saddle bags more suitable for this purpose than others. Are there any notable drawbacks or limitations associated with using a saddle bag to carry a spare chain and chain breaker, and how do these drawbacks compare to the potential benefits of having these items readily available on the bike. How do riders who regularly carry a spare chain and chain breaker on their bikes weigh the importance of convenience and preparedness against the potential negative impacts on bike performance and handling. Are there alternative methods for carrying a spare chain and chain breaker that do not involve a saddle bag, and if so, what are the advantages and disadvantages of these methods compared to using a saddle bag.