Sea to Summit Ultra-Sil Nano Dry Sack 10L
Capacity
10L
Weight
1.1 oz
Material
30D nylon
Waterproofing
IPX6
Closure
Roll-top
The Sea to Summit Ultra-Sil Nano Dry Sack is the benchmark for ultralight waterproof storage. At just 1.1 ounces, it weighs almost nothing yet delivers reliable IPX6 waterproofing through its 30D nylon construction with a silicone/polyurethane double coating. The fabric is surprisingly tough for its weight — Sea to Summit has refined this material over years of feedback from guides and serious expedition users. The roll-top closure is simple and effective: roll it down at least three times, then snap the buckle, and you have a genuinely waterproof seal.
The 10L size is the sweet spot in the range. It fits a down jacket, a base layer set, or a day's worth of snacks without becoming bulky. The bag packs down to a tiny roll that fits in your pocket. Hikers who use dry bags as pack liners often buy a set of Ultra-Sil Nano bags in multiple sizes to organize gear by category — the color-coded options help.
For the price and weight, nothing comes close. The only real limitation is that this is a lightweight bag optimized for splash and rain protection, not prolonged submersion — if your kayak fully capsizes and the bag is underwater for more than a minute, water can eventually work through. For serious whitewater use, step up to the Ortlieb below. For backpacking, hiking, and light water use, the Ultra-Sil Nano is the best dry bag you can buy.
Best for: Ultralight backpackers and day hikers
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