Here's what other sites are saying:
Snow Peak Backpack Accessories 4WAY Waterproof DRY Bag Black L UG377. Made of completely waterproof material the bag adjusts it's size by rolling the top according to the capicity within and has a valve to drain water and air.
Where to Buy
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Sea to Summit Ultra-Sil Dry Sacks
$12 - $14
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SealLine BlockerLite Compression Dry Sack Dry Bag / Compression Sack
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Outdoor Research Ultralight Dry Sacks
$13 - $36