I am looking to find an old pair of Karhu 10th Mountain skis and am wondering what length to get. I'm 150lbs at 5 foot 11 inches, but I intend to ski with a pack between 15-40lbs sometimes...like when I really need the skis for long distance touring. My question is is feasible to have a length of ski that I can use without a pack (at 150lbs) but have it also work well with a pack? If I had to only pick one, I'd choose the ski length that is most suitable when I have a backpack on. So what length would you recommend I search for?