I'm in the process of purchasing a better winter sleeping bag to open up more of winter to getting out and exploring. I used a 15 degree bag last winter but I found there were a few solid months that were just too cold (winter in the White Mountains, NH.) to safely spend the night in the mountains.
My first question is how many people still advise a long bag to accommodate gear storage? What are some good techniques for avoiding this process? Last winter I turned my dry bags inside out and stored my hikers and water bottles in the bottom of my bag. But honestly, I'd prefer to avoid these techniques if possible. In theory, I'd rather go with a well fitting bag for thermal efficiency. Is it really necessary to have that much space in the bottom? Having 5+ extra inches at the bottom and possible extra shoulder girth seems like just more space to heat up with precious calories and body warmth. Would most gear storage scenarios be small enough items to be fit alongside body or on chest?
Also, with the use of systems like trail runners and overboots (40 below light energy), is the old adage of storing your boot liners and plastics as relevant? Will trail runners freeze up to the point of being uncomfortable or dangerously cold the next morning?
As for light weight trail runners and overboots, what are people accomplishing with these systems? How comfortable are trail runners with some of the trail crampons out there? How durable are the overboots when used with trail-type crampons? Are people peak bagging in winter with these systems (I know this is relative and there is a huge amount of terrain in the world that requires mountaineering boots and full crampons, etc.)? When do you still bust out a more heavy duty boot? Does this change your needs for storing / drying gear?
Thanks!

