Pav - the Garlington insulator is designed to hold other insulation- he experimented with bags of air, bags with crinkled space blankets in bags, (trapped air= warmth) and with a 'bag o'feathers' (a down pillow, effectively) for warmth.
my hammock gear weights total: 2430g (~86oz)
Winter: total 2521 (~89oz)
(see my profile for detailed weights)
gram counter, not gram weenie!