Update Aug 2021: The new Rockshox Reverb AXS XPLR post is another good option for this purpose, especially if your bike is equipped with AXS parts.
From time to time we get asked to recommend a dropper seatpost for the UP/UPPER or for the ONE+. While both Andy and I have mixed feelings about dropper posts, they can serve a purpose. We would suggest using a limited amount of drop though, to still keep a properly-pedalling bike at all times (after all, we like riding, not just bobbing along).
People with long legs can use almost any dropper post (assuming of course it has the 27.2mm diameter to fit our frames) but with a lower saddle height, it can get tricky to get a post that goes into the frame far enough (or really, one that doesn’t stick out too far at the minimum setting). Our favourite post for that purpose (and which also work for others of course) are the KS LEV Ci, which is very nice, carbon and light and offers 65mm drop. Secondly, there is the Specialized Command XCP, which has less drop (35mm) so it fits even shorter saddle heights. But it is a bit heavier than the KS.