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Ultra-Sil Dry Sack

Sea to Summit

Ultra-Sil Dry Sack


Online inventory may not reflect in-store availability.

Ultra-Sil Dry Sack is available to buy in increments of 1

The Ultra-Sil Dry Sack won the sought after Backpacker Editors' Choice award in 2006 and is still the ideal dry sack available for backpacking. Made with lightweight, waterproof 30D Ultra-Sil CORDURA brand fabric it's the perfect choice for modular packing to organize your gear inside your backpack like a pro. With an almost translucent look, visibility of contents is easy, and if you're really organized you'll make use of multiple color options to find things easier. Other features include a non-wicking hypalon roll-top closure, a round base for ease of packing and fully seam sealed for water resistance. An excellent choice for lightweight backpacking, cycle touring and travel.



  • The Ultra-Sil Dry Sack won the Backpacker Editors’ Choice award, 2006
  • 30D siliconized high-tenacity CORDURA Nylon fabric for extra strength, durability and a smooth finish for easy packing
  • Avoid sharp or hard-edged objects and abrasive surfaces
  • Waterproof hypalon roll-top closure does not wick moisture
  • Waterproof, reinforced seams - double stitched and tape sealed
  • Reinforced stitching for greater seam strength on all stress points
  • Super compact and ultra-lightweight
  • This product is not intended for boating or marine use
  • As of 2018: Features the patent-pending 5/8in | 15mm Field Repair Buckle with stainless steel pins

What this bag could hold:

  • 1 liter: a phone (in a waterproof case - double bagging essential), snacks, wallet
  • 2 liter: some snacks, first aid essentials, gloves or beanie
  • 4 liter: shell jacket or gloves / beanie, day-hiking essentials
  • 8 liter: a two-season or a high-end three-season down sleeping bag, dry clothes for a backpacking trip
  • 13 liter: all your clothes for a backpacking trip or a mid-range three-season sleeping bag
  • 20 liter: a three-season synthetic sleeping bag plus a Sea To Summit Reactor Liner
  • 35 liter: use as a full pack liner for overnight (30+ Liter) packs

Materials: 30 Denier Ultra-Sil Cordura® nylon

Waterproof: Yes

Repair Buckle Size: 5/8" (15mm) 2-Pin

Best Use: Backpacking, Hiking, Bike Packing & Travel

Manufacturer Warranty: Lifetime against defects in materials and workmanship


Sea To Summit Ultra-Sil Dry Sacks
Dry Sack SizeDimensionsClaimed Weight
1 Liter 4.9" x 9.4"
(11 x 24 cm)
0.7 oz
(20 g)
2 Liter 5.1" x 11.4"
(13 x 29 cm)
0.8 oz
(23 g)
4 Liter 5.9" x 13"
(15 x 33 cm)
0.9 oz
(26 g)
8 Liter 6.7" x 18"
(17 x 46 cm)
1.1 oz
(30 g)
13 Liter 8.6" x 21"
(22 x 53 cm)
1.4 oz
(40 g)
20 Liter 10" x 24"
(25 x 61 cm)
1.8 oz
(50 g)
35 Liter 12" x 27"
(30 x 70 cm)
2.3 oz
(65 g)