I have seen this at Dick's Sporting Goods a year ago and I am now kicking myself for not getting one...
Has anyone here thought about a 1 pounder Dupont Halofill summer three season bag lets say 40-45 degrees for about $70 Marmot made one and so did some other company. They had a Mummy bottom and a Summer rectangular shape at the top (no hood or draft tube.) ?
Compresses to a grapefruit.