Seat Bag Contents:
- extra tube in size of tires you have on bicycle
- tire levers to remove tire in case of flat
- patch kit if you have (2) double flat or 2 tubes
- CO2 inflation or frame pump
- folding tool for emergency use
- small crescent wrench if you have wheels with nuts and not quick release
- small amount of money and identification
Most sizing systems are based on the pro athletes use of a bicycle. Still there are several that will get you close to a correct fit, but none take into account the individual fit necessary for most people.
A major factor is how you are going to use the bike. There are many different bike styles and uses today. A casual rider will want a more upright view of the ride. Flexibility and age or past injuries can be huge factors in the fit of a bike to a person.
Decide where, distances, and surfaces you are going to ride a bike on and then go to a knowledgeable bicycle shop and get fitted to a bike and the type of riding you are going to do. It is more enjoyable and fun with a proper fit, but fit is NOT a number game that most places try to make it. It would definitely be easier if it were a numbers game.