The best saddle bags are classified based on the material that they are made of and on their construction. These are also some of the determining factors for the difference in their prices. Those made of Nylon and has zippers that are not waterproof are usually more affordable compared to those that are made of waterproof zippers and material components.
Bags that are not waterproof can be equipped with some things that can protect its contents from outdoor elements especially harsh weather conditions. There are some brands that have shower caps to protect them from water splashes and sprays. There are several others that come with silicone rubber or cling-wrap shields.
If you purchase a bag that is not waterproof, make sure that you buy something to protect it from water or rain. It is important to note that leaky bags can result in rusty tools, soggy money, and useless puncture or tire patches. You can buy a plastic carrier or utilize a freezer bag that has a ziplock to prevent these things from happening.