New seat post needed

A 27.2mm seatpost might be one of the replacement bike parts for which you have the most possible options in choosing a replacement.

Personally I'm perfectly happy on alloy seatposts, and these confer less risk of breaking if overtightened, while weighing only slightly more (and usually less, pound for pound...) Good alloy posts are considerably lighter than bad carbon ones.

The Thomson elite is a great alloy one - https://www.merlincycles.com/thomson-el ... 47612.html - and is actually lighter than your Canyon one.

You can also get a similar planet X knock off for a fraction of the price - https://www.planetx.co.uk/i/q/SPOO272BK ... ost--black - it's just a smidge heavier, same ballpark as the Canyon weight wise.

You can also get cheap carbon options - https://www.chainreactioncycles.com/bra ... prod118835

And expensive carbon options - https://www.chainreactioncycles.com/rit ... prod181331

And everything in between.

To some extent this comes down to how much money you want to spend and which you like the look of....

I tend to buy seatposts based on the type of clamp. I quite like the ones with a bolt in front and one behind so you can fine tune saddle angle by loosening one and tightening the other. The Thompson Elite being a fine example

I hate the ones with a single bolt, or two side by side, which have the saddle moving in all directions when you loosen them to adjust angle or fore / aft.

On Wiggle eBay site.
https://www.ebay.co.uk/itm/Miche-Supert ... SwZL5dpv2T