The Uberlight CTF3 DrySack by Granite Gear. We pride ourselves on continual improvement, but it is going to be tough to make a lighter sack than this without utilizing some sort of antigravity technology. Absurdly light-less than ½ the weight of a comparably sized sil nylon sacks, these roll top bags are waterproof, and have 3X the tensile strength of sil nylon. Made of a material originally used as sailcloth on World Cup sail boats, the Überlight CTF3 sacks set the bar for ultralight storage.
So sorry, but only 4 items are allowed for comparison, so we're comparing the first 4. I blame the gnomes and so should you.
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