I am looking for a summer sleeping bag with a rating of 40-50 degrees. I currently have an EMS Mountain Light 20 which I like a lot but it will be too hot for this summer. I've seen some nice bags but would like to know what you guys think. I am looking for a bag that is under 1.5 lbs and under 200 dollars. I would also like atleast a half zipper so I could ventilate. Also, can I compress a synthetic bag as much as I could a down? Thanks