I'd want access to a mid-weight fleece base layer as well. You might not need it every day or all the time but fleece, especially new fleece has a LOT of insulating ability for minimal weight/space. One of my hunting buddies has the Kuiu bottoms w/zips and they're a doggone good idea for adding/sobtracting warmth pretty quickly.

I can walk on water.......................but I do stagger a bit on alcohol.