@Eoghan Thanks for reaching out!

We have three options for cargo racks that attach directly to your seat post. I apologize, however, as I'm not quite clear on what you are looking for in terms of 'bottom vs top' of the rail. If you're willing to describe what you are looking for in a little more detail and I can do my best to answer your questions, or you may be able to answer them by looking at the above options. 

Thank you for the question, I hope this helps!

John

At REI, we believe time outside is fundamental to a life well lived.
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