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Sea to Summit Ultra-Sil Pack Liner

Sea to Summit Ultra-Sil Pack Liner
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The Ultra-Sil™ Pack Liner won the prestigious Backpacker Editors' Choice award in 2006 and this award winner is an excellent solution for keeping contents of your pack dry. It's made of 30D Ultra-Sil™ CORDURA® brand fabric, making it super lightweight and is an oval shape to fit inside packs easier. The extra wide opening roll-top closure folds in three before being rolled and sealed with the low profile buckles. Sea to Summit has used bright colors to help with visibility when packing and unpacking, and a 50L, 70L and 90L size range to cover all options and bag sizes.



  • Durability
  • Keep it inside your pack and away from hard edges and corners.
  • Waterproofness
  • Should be kept in another bag or backpack

Best Use - Backpacking, Travel

  • Ultra-Sil Pack Liner opens wide for easy packing when it's inside a pack
  • Unique top closure: extra fabric at the top folds in and hook and loops into place, then rolls down, creating a more compact closed loop at the top
  • Made of PU coated siliconized CORDURA®
  • Waterproof hypalon roll-top closure does not wick moisture
  • Waterproof seams - double stitched and tape sealed
  • Low profile buckles
  • Slippery finish for easy packing


Pack Size
50 L / up to 3000 cu in
2.6 oz / 74 g
70 L / up to 4300 cu in
3.4 oz / 98 g
90 L / up to 5500 cu in
4.4 oz / 126 g

Part Numbers

Option UPC MPN Store SKU
Green / 70L 9327868010264 289 Kiwi Green SEA453909349