Sea To Summit Ultra-Sil Compression Dry Sack (10L - 20L)


The Ultra-Sil Compression Dry Sack is a super lightweight dry sack designed to compress bulky clothing or other squishable gear that lives inside your pack. Made from Ultra-Sil 30D CORDURA® Nylon fabric with an eVent® fabric base, the air can be rolled out but can't get back in. It's an ideal option for use inside a backpack during longer lightweight hikes, cycle touring and any activity where you need to maximize pack space by compressing your bulky items to one-third of their volume. It employs waterproof seams, a hypalon roll-top, non-wicking closure and is super lightweight.


  • Air permeable eVent® fabric base allows air to be pushed out but water can't get in
  • Waterproof seams - double stitched and tape sealed
  • Waterproof hypalon roll-top closure with lid and 4 straps for compression
  • Lightweight Ultra-Sil body
  • Reinforced stitching on all stress points
  • Roughly half the weight of the original eVent Compression Dry Sack

Size Guide:

  • Small / 10 liters: a two-season or a high-end three-season down sleeping bag or a larger puffy jacket
  • Medium / 14 liters: a mid-range three season sleeping bag
  • Large / 20 liters: a three-season synthetic sleeping bag plus a Reactor Liner

Technical Specs:

S / 10 Liter M / 14 Liter L / 20 Liter
Compressed Volume 10L to 3.3L 14L to 4.5L 20L to 6.7L
Dimensions 7 x 16 in 8 x 18 in 9 x 20 in
Weight 2.6 oz 3.2 oz 3.4 oz

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