> Who has the lightest waterproof stuff sacks?
Sea-to-Summit has a new line of Ultra-sil/Cordura Dry Sacks; the 8L weighs 1.2 oz. Reynolds Oven Bag, turkey-size 19" x 23.5", 0.5 oz, makes a great clothing bag. Glad 13-gal kitchen trash bag, 0.8 oz, is plenty big for a sleeping bag. An empty 40-pound pellet-stove pellet bag, 1.8 oz, is about the same size and will stand up to abuse (trash compactor bags are similar).
OR Helium Quick-Sacks are light but only listed as water-resistant; the 10L weighs 1.0 oz.