USMC SealLine MACS Sack

Waterproof Compression Sack

The SealLine MACS Sack is a 9-liter dry bag and compression sack in one, developed with the US Marine Corps to keep spare clothing, sleep layers and other soft goods dry inside a field pack. Roll the top down to seal out water, then press the bag to push air out through the purge valve so the load packs smaller. Marines carried it inside ILBE and FILBE pack systems. Hikers, paddlers and campers use it the same way, as a light, sealed liner for the gear that has to stay dry.

Features

• 9-Liter Capacity — The sack holds 9 liters (549 cubic inches), enough for a fleece, base layers or a compact sleeping layer.
• DrySeal Roll-Down Closure — SealLine's own closure seals watertight when you fold the stiffened top over itself several times and clip the buckle.
• Low-Profile Purge Valve — A flexible valve on the side lets trapped air escape when you compress the bag, so the contents pack down tight and stay that way.
• 210D Oxford Nylon Body — The fabric is 210 denier (a measure of thread weight) oxford-weave nylon with a high-tenacity polyurethane coating that blocks water.
• Compact 7 x 13 Inch Size — At 7 inches in diameter and 13 inches tall, it fits upright in the main compartment of most rucksacks.
• 3.3 Ounce Weight — The empty sack weighs 3.3 ounces, so it adds almost nothing to a pack load.
• Built For ILBE And FILBE — It was designed to work inside the Marine Corps' Improved Load Bearing Equipment and later FILBE pack systems.
• Label Window And Buckle Strap — A printed panel on the front gives you space to mark the contents, and a black strap with a side-release buckle holds the rolled top closed.

Marine Corps Issue

This is issued government gear, catalogued under National Stock Number 8465-01-542-7688, the identifier the US military uses for items in its supply system. SealLine developed the MACS Sack with the Marine Corps and manufactured it in the USA in olive green to match issued pack equipment. Buying the issued version gets you the exact bag built to the Corps' requirements, made by the same company that supplied it.