Sea to Summit Ultra-Sil® Dry Sack

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The new Sea to Summit Ultra-Sil® Dry Sacks are more than 50% lighter than our super popular Dry Sacks. They’re made of Siliconized Cordura®, which is one of the lightest and toughest waterproof nylon fabrics available. Now you don’t have to choose between keeping your gear dry and keeping it light.

  • A Backpacker magazine Editors' Choice Award Winner!
  • Super compact and ultra lightweight
  • Made of Ultra-Sil™ nylon, a polyurethane coated Siliconized Cordura® for ultimate waterproofing and maximum durability
  • Non-wicking Hypalon® roll top closure with stiffener at the top for a better seal
  • Soft and flexible with a slippery finish for easy packing
  • Nearly transparent allowing good visibility of the contents
  • All seams are double stitched and tape sealed
  • Smaller sizes have flat bottoms, others are round
  • Colors: kiwi green, sky blue and orange
Specs Sizing Reviews

Proper Use:

  • Any roll-top dry sack must be closed properly to ensure water can’t get in.
  • Begin by folding the Hypalon™ strip down first and be sure to have at least three rolls before closing the buckle.
  • Avoid contact with sharp objects or subjecting the sack to high abrasion, as this could compromise the waterproof fabric.
  • Ultra-Sil Dry Sacks should only be used to store sensitive electronic devices when used in conjunction with another, heavier-duty dry bag – the “double bag” method. For maximum protection of electronics the use of a waterproof hard case with a mechanical seal should be considered.
  • This product is not intended for boating or marine use.
Size Dimensions Weight
XXS / 1L 4.3x9.4 .7 oz
XS / 2L 5.1x11.4 .8 oz
Small / 4L 5.9x13 .9 oz
Medium / 8L 6.7x18 1.1 oz
Large / 13L 8.6x21 1.4 oz
XL / 20L 10x24 1.8 oz
XXL / 35L 12x27 2.3 oz


Reviews for the Sea to Summit Ultra-Sil® Dry Sack


5/5 stars based on 1 reviews.

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I have used multiple sizes for the last three years and they are AMAZING. It helps organize your pack and best of all it keeps the contents dry. Being from Colorado, this is a definite plus when you need to dig into your pack when there's lots of powder blowing around during the winter or during the summer in a serious downpour. In the off season, they pull double duty in helping you organize your suitcase (no more lost socks thanks to the TSA!). The only quibble I would have with these is that after a year of heavy use the band in the roll-top closure stays curved. Highly recommended for everyone!

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  • Ultra-Sil® Dry Sack
  • Ultra-Sil® Dry Sack
  • Ultra-Sil® Dry Sack
  • Ultra-Sil® Dry Sack
  • Ultra-Sil® Dry Sack

  • Ultra-Sil® Dry Sack

  • Ultra-Sil® Dry Sack

  • Ultra-Sil® Dry Sack

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