The disco 15 fascinated me but the WM terralite 25 was so much lighter and made in USA. I feel like I can use my down outer layers (which I would carry anyway). to gain those extra degrees. Both bags are seemingly side sleeper friendly.I’ve been looking at the Stone Glaicer Chilkoot or a Nemo Equipment Disco 15 degree bag, both are just over the 2 lbs mark and have good reviews