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The title makes it clear.
0.8 oz Dyneema Composite Fabric
This is fairly lightweight and easy to work with. It's 30% lighter than the 1.1 material Hyperlite uses for their dry stuffsacks, but I was easily able to produce (relatively) air tight sacks from this .8 material. It'll be interesting to see how they stand up to field usage, though.
A++++, not much to add