Bike backpacks have been specifically designed to be comfortable while riding. Some bike backpacks even have a built-in water reservoir. A proper bike backpack doesn't chafe or rub, and has extra ventilation on your back. Combining comfortable straps with optimal back ventilation is key to most riders. Most backpacks either have a hydration system, or have been prepared to be fitted with one. Never have to reach for your bottle again; just sip on fresh water as you go!
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