Ultra-Sil Nano Dry Sack
BEST USE: Backpacking
WATERPROOF? Yes, in situations where the dry bag will not be submerged
DIMENSIONS: 5.1 x 3 x 9.4 inches
WEIGHT: 0.5 oz | 13g
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
Designed with ultralight backpacking in mind the Ultra-Sil™ Nano™ Dry Sack is made from lightweight 15D siliconized Nylon. With the use of featherweight 15D fabric, these are perfect for use inside your pack to keep gear organized and dry. Using a hypalon roll-top closure that doesn't wick moisture, an oval base for easy packing, these are fully seam sealed for water resistance. Ideal for backpacking, climbing, cycle touring and modular packing where lightweight and low bulk is key.
One of the lightest coated fabrics that Sea to Summit manufactures, the 15 Denier Ultra-Sil is a siliconized nylon fabric with a polyurethane (PU) inner coating for mild waterproofing. This ultralight fabric has a 1,200mm hydrostatic head.
Best UseBackpacking, Hiking, Bike Packing & Travel
ClosureWaterproof roll-top closure
Material(s)Ultralight Ultra-Sil Nano 15D nylon fabric
MeasurementLength - measured with roll-top closure open Volume - measured with closure rolled 3 times
Repair Buckle Size5/8in | 15mm (2-Pin)
ShapeOval base to resist rolling and an ideal height-to-width ratio for easy packing
|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 (1200+ 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.