Ultra-Sil Dry Sack
BEST USE: Backpacking
WATERPROOF? Yes, in situations where the dry bag will not be submerged
DIMENSIONS: 4.9 x 9.4 inches
WEIGHT: 0.7 oz | 20g
Shipping & Returns
Our warehouse is actively shipping orders from 8am to 1pm MST Monday through Friday. Most orders ship in one business day, but the transit time can take up to 7 days, depending on your distance from Boulder, Colorado.
2nd Day and Next Day Air orders will ship same day if placed by 1pm MST, Monday-Friday (except holidays).
All orders are eligible for fast and easy returns within 60 days of purchase.
For more details, please check out our Help Center
The Ultra-Sil Dry Sack won the sought-after Backpacker Editors' Choice award in 2006 and remains the ideal dry sack for backpacking and travel. Made with lightweight, waterproof 30D Ultra-Sil fabric featuring CORDURA® yarns, it's the perfect choice to organize your gear inside your backpack or duffle like a pro. The semi-translucent fabric makes it’s easy to see what’s in each dry bag. 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.
An incredibly lightweight yet durable fabric used in a large number of Sea to Summit products. This 30 denier Nylon is made with CORDURA® yarns for strength, woven into a ripstop pattern. Two versions of the fabric are used:
- Water-resistant products (such as the Ultra-Sil™ Stuff Sacks) are siliconized on both sides for ultimate packability
- Waterproof products (such as the UltraSil™ Dry Sack are) siliconized on the outside and PU-coated on the inside to allow seam taping.
- Both versions have a hydrostatic head greater than 2000mm – which makes them more than adequately waterproof for the types of environments they are intended for.
Cordura® is a special type of nylon yarn used for its strength. These yarns are used in two different product areas:
- In the siliconized Ultra-Sil™ fabrics used in Ultra-Sil™ Dry Sacks, Stuff Sacks, Compression Sacks, Pack Covers, Travelling Light and Travel Essentials products
- In the foot section of the extremely tough eVent® Quagmire Gaiters.
Best UseBackpacking, Hiking, Bike Packing & Travel
ClosureWaterproof durable roll-top closure
Material(s)30 Denier Ultra-Sil Cordura® nylon
MeasurementLength - measured with roll-top closure openVolume - measured with closure rolled 3 times
Repair Buckle Size5/8in | 15mm (2-Pin)
ShapeCylindrical with an ideal height-to-width ratio for easy packing
WaterproofPerfectly adequate for dry storage inside a backpack, bike bag or duffle
|1 liter||2 liter||4 liter||8 liter||13 liter||20 liter||35 liter|
Frequently Asked questions
Suitable for paddle sports?
No. Featherweight fabrics are not appropriate for the sharp or abrasive elements in watersports. We recommend Lightweight Dry Sacks for general paddle use.
The body of the dry sack is more than adequately waterproof (2000+ mm hydrostatic head) for the intended use (storage inside a backpack or duffle).
Worth their weight and cost?
Once you've experienced modular packing with ultralight, easy to pack, translucent dry bags, you’ll wonder how you ever lived without them.