Originally Posted by johngwheeler

I have a carbon cross bike that doesn't have any bosses for fitting a rack. I have another commuter bike with Ortlieb & Topeak panniers, for heavy loads, but was wondering what options there are for bikes which can't easily fit a heavy-duty rack?

I've seen some "light duty" racks that fit to the seat post, but have no idea if these are any good, or whether they would hold a bag large enough my daily gear. I need to be able to transport a 15" laptop & accessories, and a set of clothes (normally packed in an Eagle Creek "envelope" to keep them flat).

I could just wear a back-pack or course, but this would probably end up about 6-8kg (c 18lbs), and I don't really like wearing a lot of weight on my back when cycling - too sweaty and a bit unstable.

What other options would work for laptop-sized loads?

Thanks for your advice!

John