Would you have to put a special bag on this rack?
Any rack attached with p clips...unless it's a carbon bike...then either beam rack (note quite strict weight limits which need to include the bag) or seatcollar attachment could work
Or get a Carradice with the seat post attachment thingy @jefmcg for details
That works great for a 13" Macbook in a sleeve, but nothing larger.What about a Carradice SQR slim?
Yes, you need the bag that slides on. These are great, will do exactly what you need, just beware how much weight you add in addition to the weight of the bag. Note, can't use the beam racks on a carbon seat postWould you have to put a special bag on this rack?
I want carry my laptop in which is under about 1.5 kg has any one stuck laptop on these kind of pannier rack?
Thanks for your help
If I change my seat post to a different one will di2 fit the same way or would I need to change the clamps inside the seat post is there any way of checking with out buying and trial and error?Yes, you need the bag that slides on. These are great, will do exactly what you need, just beware how much weight you add in addition to the weight of the bag. Note, can't use the beam racks on a carbon seat post
https://www.amazon.co.uk/d/Bike-Bac...9916&sr=8-2&keywords=topeak+mtx+exp+trunk+bag
No idea, why don't you ask your LBS Is the bike carbon?If I change my seat post to a different one will di2 fit the same way or would I need to change the clamps inside the seat post is there any way of checking with out buying and trial and error?
Yeah the bike is carbon asked the concept store and they said it should be fine to swap the seat post as the centre tube would be able to handle the load.No idea, why don't you ask your LBS Is the bike carbon?