So im looking for a sleeping bag it Must be synthetic since im allergic to feathers. i know kind of throws a screw in things but cant help that. i was thinking something in the 0 to 15 degree rating. and i would like to stay under 150 since i dont make much but i know quality usually pays for itself. any advice? (ps anything under 5 pounds would be light for me being my bag that i have now weighs 9lb)