I have a cheaper down bag, a Kelty Cosmic. It weighs in at 2lbs 8oz. I'm ok with the weight, but the sack size is about 8"x 16" or so. That is the stuff sack that came with the bag. The bag is a 550 fill. The question; will it hurt the bag to get one of those compression bags with the straps to "suck" that dude down to a smaller size when on trips?