USMC SealLine Sleep System Waterproof Compression Sack

The US Marine Corps SealLine Sleep System Waterproof Compression Sack is originally designed to be issued with the USMC 3-Season Sleep System. This compression sack has a unique design that dramatically increases the performance of both the compression and waterproof aspects. Should you not have a USMC 3-Season Sleep System this compression bag can be used to keep virtually any sleeping bag or essential gear compressed and dry.

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The SealLine Sleep System Compression Sack is one of the most advanced compression sacks available. This compression sack serves double duty in the field being both a high performance compression sack as well as completely waterproof. There may be no more important factor in a successful overnight hike than dry sleeping arrangements and this USMC waterproof compression sack will help ensure your sleep gear stays dry no matter how torrential the rain gets.

While most waterproof compression sacks just use trilaminate materials for water resistance the SealLine compression sack is different. The materials used to construct the compression sack are water resistant but there are additional enhancements for performance. The two black striped lines act as a double water tight seal for the top of the compression sack keeping everything inside nice and dry. There is an air purge valve on the side of the compression sack that once you put pressure on the sack will force out air inside the sack. This results in tighter compression for a smaller profile and enhanced waterproof performance that few if any compression sacks can compete with.

  • Authentic USMC 3-Season Sleep System Compression Sack
  • USMC Brown Color
  • Keep Sleep Gear, Food, or Essentials Dry
  • Waterproof in Heavy Rain
  • Contents Stay Dry with Submerged for 30 Minutes
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US Army Surplus
Overall Rating
Quality product
Review by Cary
I purchased 6 of these bags. All appear to be never used or lightly used. High quality bag. Not as large as I hoped. Should work for 1 sleeping bag with the bivi but not both bags and the bivi. Also should be good for anything you could get in it to help keep it dry. If they got cheaper I would buy more.

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