I traditionally have worn a hardshell ski pant when ski touring. The waterproofness is nice insurance against getting totally soaked and cold, but for spring missions where temps are going to be above freezing for most of the day I decided that a softshell pant would be better for breathability and some stretchy comfort.

Different people seem to find a different sweet spot in terms of reliable pack size, while in the past I've often felt like whatever range of packs I own, I always want one slightly bigger or smaller for my planned adventure.