Sea to Summit Ultra-Sil® Nano Dry Sack


 Editor: Cameron

Basic Description:

Sea to Summit’s lightest dry sack made out of a 15d nylon fabric for increases strength in a lightweight package.

Just the Facts:

  • Ultra-Sil® Nano 15 D nylon fabric for advanced strength to weight performance
  • Ultra-Sil® Nano has a 1,200mm waterhead
  • Fully seam-sealed for maximum water-proofness
  • Reinforced stitching for greater seam strength on all stress points
  • Hypalon® roll top closure does not wick moisture
  • Siliconized fabric with a smooth finish for easy packing
  • Compact and super lightweight
  • Oval base design for easy packing
  • Suitable to keep contents dry in any wet situation where the bag is not submerged
  • Available in Blue, Green, Orange



I hunt and live in Oregon. If you have never been it rains a lot. When I say a lot I mean all day everyday during my hunting last year. Your gear in your packs will be wet by the end of the day. I don’t care what pack you have it is going to get wet on the inside at some point if you hunt in Oregon.  Pack covers are noisy, ugly and in my opinion a pain to use. So the best way to keep gear, clothes and electronics dry is to use dry sacks. If you get a standard dry sack they can weigh 3-4 oz for a 13 Liter dry sack. That weight can really add up if you have 4 or 5 in your pack.  I then discovered Sea to Summit and their new Ultra-Sil Nano Dry Sacks. A 13 liter dry sack weighs 1 oz and their largest 35 liter weighs 1.6 oz!! For a weight conscious hunter these are looking like a great option.


The roll top closure is just like any roll down dry sack and has a stiffener to help get a seal while you are rolling it down.  Some might question the durability of the UL products from any company but I can say for organizing and keeping gear dry inside a backpack I have no worries. I probably wouldn’t use this if I was a paddler or going to have this strapped to outside of my pack going through black berry bushes but the fabric was tougher than I was anticipating.   Time will tell with the overall durability but the taped seams and fabric seem to be plenty strong and well put together.


I haven’t even gotten to the best part yet. The 13 Liter cost just over $20!! For an UL dry sack that is very cheap.  I think Sea to Summit hit one out of the park with this product. I can cut 8-10 oz out of my pack weight now and it only costs me $90 to do so. For you oz counters that is about $10 per oz and is worth the switch just for the weight savings alone!




What they could do better:


            Nothing, at this price point they are perfect.


Sea to Summit Ultra-Sil® Nano Dry Sack review
  • Functionality
  • Value
  • Ergonomics
  • Durability