
Ultra-Sil Dry Day Pack
Get notifiedHighlights
BEST USE: Day Pack
WATERPROOF? For its intended use, yes. The pack is made of a waterproof material with a roll-top closure: it will withstand heavy rain, but is not intended for paddling
DURABILITY: Sharp objects or abrasive surfaces can damage the fabric
DIMENSIONS: 19 x 12 x 9 inches
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
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Description
The Ultra-Sil Dry Day Pack is a waterproof, packable daypack made from siliconized CORDURA® fabric. As well as being ultra-lightweight and foldable, it also resists water and packs into its own tiny stuff sack which comes complete with a carabiner key ring attachment. The seams are double stitched and sealed with high-density PU seam tape and the unique, double hypalon roll-top is non-wicking and creates a good seal. The compression lacing system on the front rounds off this light and functional pack.
Features
- Ultra-Sil 30D siliconized CORDURA® fabric for strength and durability
- Reinforced shoulder straps for increased carrying comfort
- Packs into an attached stuff sack that includes a handy carabiner
- Double stitched seams and fully tape sealed construction
- Elasticized compression lacing system
TECHNICAL FEATURES

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.
Tech specs
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Best UseSummit Pack, Bike Commuting
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FabricSiliconized Cordura fabric
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Pack AccessTop (hypalon roll top)
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SpecialReflective compression lacing system
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WaterproofYes
22 liter |
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Frequently Asked questions
Capable of carrying heavy weights?
Yes. The seams and materials will support a surprising amount of weight. But – the pack and shoulder straps are not padded, so we would not suggest carrying anything above 15 lbs / 7 kg for anything more than a short duration.
Waterproof?
For its intended use, yes. The pack is made of a waterproof material with a roll-top closure: it will withstand heavy rain, but is not intended for paddling
Going to last?
Yes, the construction and durable materials of the pack with hold up with correct care.