The Rapha Bar Bag attaches to a bike with the help of three straps: two that go around the handlebars and one that goes under the stem.
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There is an additional strap on a side that I assume can be used to attach the bag to a seat post and convert it into a frame one. However, I haven’t tried it as I am afraid of damaging my carbon frame.
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Overall attachment system seems excellent! The straps are secure and don’t get loose, even when riding on bumpy roads. Also, you can easily adjust the length of the straps to fit your bike perfectly. Unfortunately, it’s hard to perfectly attach this bag to my bike because of all the cables, but that issue lies with my bike’s design and not Rapha. You might experience the same problems, however.
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Beware that a carbon stem can get damaged by a plastic buckle. I would recommend using a special protective tape in this case.
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I’m also pleased with how well the Rapha Bar Bag performs on rough roads and uneven terrain. There’s minimal bouncing, and the attachment system is holding up really well!
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Overall, I am pleased with the attachment system and score it 10/10.