Saddles can suffer a lot of abuse and covers are a great way to extend the life of a saddle. Reader Tsai-Ching sent along this saddle cover hack.
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I had my bike for 7 years and the saddle has never changed. I used it for years but it was worn by the weather and aging of the material, so I replaced it with a cover made from my old backpack. I just cut the required area from the backpack, did some sewing, and then tied it to the seat post with a line.