So Im unsure of what temp rating to get for my backup/guest bag. I have purchased a 20 deg slick bag for myself and feeling pretty good about that, Im pretty tolerant of temp so I might have been able to go with a warmer bag but its too late now. So for my other bag it looks like its a 30 deg or 15 deg. I would like to be able to use the bag from early season scouting (aug) to mid season hunting(mid-late sept) I will be hunting in the cascade high country around 4-6000 ft. Was just worried the 15 temp bag would be too warm for the early scouting season but also that the 30 deg wouldn't be warm enough for the hunting. What would be the best option? Bags Im looking at are the marmot 15 Deg helium, 15 deg pinnacle, and 30 deg hydrogen.