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Sea to Summit Ultra Sil Dry Sack

  • Product Number: 4820

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.

What This Bag Can Hold:

  • 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


  • The Ultra-Sil Dry Sack won the Backpacker Editors’ Choice award, 2006
  • Perfectly adequate for dry storage inside a backpack, bike bag or duffle
  • 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

Specifications & Sizes:

  • Materials: 30 Denier Ultra-Sil Cordura® nylon
  • Measurement: Length - measured with roll-top closure open Volume - measured with closure rolled 3 times
  • Repair Buckle Size: 5/8in | 15mm (2-Pin)
  • Shape: Cylindrical with an ideal height-to-width ratio for easy packing
Specs 4 Litre 8 Litre 13 Litre
Weight 0.9 oz / 26g 1.1 oz / 30g 1.4 oz / 40g
Dimensions 5.9 x 13 in / 15 x 33 cm 6.7 x 18 in / 17 x 46 cm 8.6 x 21 in / 22 x 53 cm
Gear Capacity 4L 8L 13L