What are the best bags for bike riders to carry their essentials while cycling?

The best bags for bike riders to carry their essentials while cycling are typically backpacks, messenger bags, or saddle bags. These bags are designed to securely hold items while riding and are often water-resistant to protect belongings from the elements. Backpacks are versatile and can hold a variety of items, while messenger bags are easy to access while riding. Saddle bags attach to the bike itself and are great for carrying tools or smaller items. Ultimately, the best bag choice depends on personal preference and the specific needs of the rider.