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1.9 oz silicone coated ripstop nylon. Including the coating, the total weight is about 2.4 oz per square yard. This material is fairly strong, has good abrasion resistance, and is waterproof. The silicone coating is stronger and lighter than urethane coating used on similar fabrics. We use it on the base, side pockets, and straps of our Z1 pack for extra durability.
1.1 oz silicone impregnated ripstop nylon. Total weight is 1.3 oz per square yard w/ the silicone. The silicone is added as part of the manufacturing process (as opposed to being coated), making it slippery on both sides. Very strong for its weight, moderate abrasion resistance, waterproof. A good all around material.
SpinnTex Pro .8 oz silicone impregnated nylon. Total weight is .97 oz per square yard with the coating. This is basically just a lighter/weaker version of the 1.1 oz sil-nylon. It is also very crinkly sounding like a potato chip bag until it breaks in.
.6 oz/sqyd Cuben Fiber fabric. This is the material used in the cuben fiber stuff sacks. The material is constructed of a grid of white spectra threads laminated to a thin clear polyester membrane. It is not coated, but is waterproof. The material has high tensile strength, however the polyester membrane has a bit lower abrasion and tear resistance than sil-nylon. It is also very expensive.
~1.5 oz/sqyd Cuben Fiber fabric. This is the material used for the "Blast" backpacks. It is more than twice as thick as the lighter version, and has a thicker membrane as well. It has high tensile strength, and very good abrasion and puncture resistance. Much stronger than sil-nylon or the .6 oz fabric.