Sea To Summit Ultra-Sil Dry Sack

Sale price
List price
You save
$3.59 (20%)
Color:Pacific Blue
This item is temporary out of stock

The Ultra-Sil™ Dry Sack won the sought-after Backpacker Editors' Choice award in 2006 and is still the ideal dry sack for backpacking and travel. Made with lightweight, waterproof 30D Ultra-Sil™ fabric featuring CORDURA® yarns it's the perfect choice for modular packing to organize your gear inside your backpack or duffle like a pro. The semi-translucent fabric means that it’s easy to see what’s in each dry bag, and if you're really organized you'll make use of multiple color options to find things even easier. Other features include a non-wicking hypalon roll-top closure, a round base for ease of packing and taped seams to keep moisture out. An excellent choice for lightweight backpacking, cycle touring and travel.

  • Siliconized on the outside, tough Cordura® nylon is weatherproof, lightweight and durable for hiking and backpacking in wet conditions
  • Polyurethane coating on the inside permits the fabric to be seam taped; waterproof seams are double-stitched and factory-taped for added weather protection
  • Hypalon 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
  • Ultra-Sil sacks are designed for use inside a backpack and are not suitable for boating
  • Comes in assorted colors only; sorry, specific color requests cannot be accommodated
  • Field Repair Buckle can be replaced with just a screwdriver
Technical Specs
Best Use-


Gear Capacity (L)-

2 L: 2 liter

4 L: 4 liter

8 L: 8 liter

13 L: 13 liter

20 L: 20 liter

Gear Capacity (cu. in.)-

2 L: 122 cubic inches

4 L: 244 cubic inches

8 L: 488 cubic inches

13 L: 793 cubic inches

20 L: 1220 cubic inches






PU-coated, siliconized 30-denier Cordura nylon


2 L: 5.1 x 11.4 inches

4 L: 5.9 x 13 inches

8 L: 6.7 x 18 inches

13 L: 8.6 x 21 inches

20 L: 10 x 24 inches


2 L: 0.8 ounces

4 L: 0.9 ounces

8 L: 1.1 ounces

13 L: 1.4 ounces

20 L: 1.8 ounces

You may also like


Easy Returns

Need to return an item? Check out our policy below
Return Policy

Lowest Price Guarantee

Find a better price? We'll beat it!
Price Match Policy