Here's what other sites are saying:
In the age of ultra-lightweight everything Sea To Summit has developed a range of ultra-lightweight dry sacks to save those crucial few grams. Using a 15 denier Sil/PU nylon fabric they call Ultra-Sil Nano, a lightweight side release buckle and a thinner roll top closure they have created a dry sack that is 30% lighter than their standard 30 D Ultra-Sil Dry Sacks.
- Mountain Gear
Keep your on-trail, on-deck, and on-board wares protected from the elements with the Sea to Summit Ultra-Sil Nano Dry Sack. Weighing scantly an ounce, this waterproof barrier might be silly light, but when it comes to repelling water and standing up to Mother Nature's wrath, it's uber-serious.
Saving crucial grams, the Sea to Summit Ultra-Sil Nano Dry Sack is an ultra-lightweight and waterproof backpacking stuff sack. Using a polyurethane coated, 15-denier siliconized nylon, fabric is waterproof, lightweight and durable for hiking and backpacking in wet conditions. Polyurethane coating on the inside offers the ultimate in waterproofness; seams are reinforced for strength and factory-taped for weatherproof protection. Hypalon(R) watertight roll-top closure keeps contents secure and protected; fold the Hypalon strip down first and make at least 3 rolls before closing the buckle. Roll-top fabric sacks are not intended for complete submersion; sensitive electronic devices should be double-bagged or packed in a waterproof hard case for maximum protection. Comes in assorted colors only; sorry, specific color requests cannot be accommodated.
Sea to Summit Ultra-Sil Compression Dry Sack
$30 - $34
Sea to Summit Ultra-Sil View Dry Sack
$16 - $44
Sea to Summit Ultra-Sil Dry Sacks
$11 - $32
Sea to Summit eVAC Dry Sack
$18 - $21
Sea to Summit Lightweight Dry Sack
$11 - $199
Sea to Summit Trash Dry Sack
$30 - $34
Sea to Summit Big River Dry Sack
$20 - $56
Granite Gear DrySack
$14 - $22