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that clamp design but cylindrical all the way up
Their round one has a slightly different clamp
https://www.aliexpress.com/item/TOSEEK-bicycle-3K-UD-Matte-carbon-seatpost-MTB-road-bike-seat-tube-carbon-seat-post-27/32794789291.htmlThere are round ones on AliX with the same clamp as my "aero" one, e.g.
https://www.aliexpress.com/item/No-marked-the-world-s-top-full-carbon-fiber-seat-tube-seat-tube-seat-post-road/32789403845.html
Like this? It's a Toseek, I got it via Amazon but they are on eBay and AliX too. You'll want to change the stock bolt to one about 5mm shorter. Has survived about 30 miles with >100kg load so far. On the other hand, if you want to play safe, a Kalloy SP248 is half the price and less than 1/4lb heavier.