USMC SealLine MACS Sack

The USMC SealLine MACS Sack is a high performance waterproof dry bag developed for US Marines. This dry bag was designed and manufactured by Cascade Designs who created the combat tested and battle proven SealLine compression sack for the USMC 3-Season Sleep System. Capable of keeping your essentials dry and secure this handy dry bag will also float if it falls into water.

In stock

SKU 8465-01-542-7688


The USMC SealLine MACS Sack is a high performance dry bag that should be part of any outdoor gear enthusiasts arsenal. This bag is capable of protecting your most important items from the rain no matter how strong the storm is and it has an extremely low profile for space concerns. You can put your electronics or other gear that can be ruined by the rain into this bag, seal it, and you will have no concerns to worry about while on the move.

The US Marine Corps has assigned the MACS Sack a Level 2 water resistance rating. This means that it will protect your gear during heavy rain and can also withstand brief submersions in the water. Should your MACS Sack drop into the water it is designed to float giving you plenty of opportunity to retrieve it without needing to worry about damage to the contents. Combat tested, battle proven, and Marine proof this dry bag is perfect for all users.

  • Authentic US Marine Corps Issue Dry Sack
  • Compact, Rugged, Lightweight Design
  • Integrated Air Purge Valve
  • Dimensions: 7" x 13" (Approximate)
  • Capacity: 540 Cubic Inches (Approximate)

More Information

Brand US Army Surplus
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Customer Reviews

Bought another one

Review by Edison X.
Verified Buyer

Both the bags I received arrived in brand new condition. The material is lightweight but tough, and the one-way vent to remove air when you are compressing it is a nice feature.

Keeps gear dry

Review by Ferlin T.
Verified Buyer

I love these. Keeps your socks or other things dry.

Waterproof sack

Review by Pono V.
Verified Buyer

Great size for clothes and smaller items.

have not found a use

Review by Aarin T.
Verified Buyer

have not found a use yet for this.

AMERICAN MADE USGI surplus! Need I say more?

Review by Rojelio Q.
Verified Buyer

If you hike, camp or prep, these AMERICAN MADE Dry Sacks are what you want!

Nice bag for smaller items,

Review by Armaan P.
Verified Buyer

Nice bag for smaller items, to help organize your pack. Seems well made. Have it in my Bug out bag, ready to rock.

Good quality, like new!

Review by Eva N.
Verified Buyer

Good quality, like new!

Prompt and Quality Customer Service

Review by Domanic N.
Verified Buyer

I ordered one of these and it was shipped fast.

These are great,work well,light weight.

Review by Callan K.
Verified Buyer

These are great,work well,light weight.


Review by Teddrick E.
Verified Buyer


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