Bottle cage
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A bottle cage is a bicycle accessory used to affix a water bottle to the bike. Composed of plastic, aluminum, stainless steel, or carbon, it is attached to the main frame of a bicycle, the handlebars, or behind the saddle. Most modern bicycles have threaded holes drilled into the frame to hold the bottle cage. Clamps are necessary on older bicycles for this purpose.
To avoid clutter and to carry more water, many riders have adopted hydration packs like the CamelBak. For mountain cyclists, hydration packs also have the advantage of holding the rider's water supply away from muddy trails. Traditional frame-mounted bottles often become mud-spattered.
Some examples of bicycle lighting take advantage of the bottle cage by using it to hold a bottle-shaped battery to power the lights. This sort of bicycle lighting has proved popular.