hushshI have the insulated Static V light and love it, saves you 2/3 of a pound and packs down smaller than a Nalgene 32 oz. The R value of the Lite vs the Luxe is 4.4 vs 5.0 (latter taken from their website) My vote goes to the lite unless you pack in a large rectangular sleeping bag. The Lite fits my Kelty Tuck just fine...