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The braze-ons beneath the down tube are traditionally for mounting a third bottle cage. Of course that bottle is more exposed to road dirt than the others, so many people use it for various utility purposes. (You can get water-bottle-shaped repair kits that will fit in there, batteries, air reservoirs for air horns and I'm sure other things as well.) It ...


Several manufacturers, (Apidura being just one) make top tube bags that use a bolt on mount. Some use a shouldered screw for the mount. This mates to a keyhole shaped holes in the bag frame. It slips on and locks into position. You can search for bolt-on top tube bags to find a model that fits tour needs.

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