Helikon-Tex Arid Dry Sack Medium — Olive Green / Black

The Arid Dry Sack Medium is a waterproof roll-top bag designed to protect gear from moisture during outdoor activities, hiking, water crossings, or operations in adverse weather conditions. The Medium size offers enough volume to hold a bulky insulated jacket, a full change of clothing, or a compressible sleeping bag.

Water resistance depends on two elements that must work together: the fabric and the seams. The body is made from lightweight material with a waterproof coating, while the seams are taped rather than stitched alone, eliminating the infiltration points that conventional stitching leaves exposed. The roll-top closure folds over itself and, with the correct number of rolls, creates an effective barrier against rain, splashes, and high ambient humidity. It should be noted that a roll-top dry bag is not a certified waterproof case for prolonged submersion: it is designed to resist surface water, not to be submerged.

The low weight makes it suitable for those who want to keep it inside a pack as additional internal protection for moisture-sensitive gear, without adding any noticeable load. The cylindrical shape, once the closure is rolled down, fits easily inside irregularly shaped packs or can be attached externally.

Key points

• Taped seams eliminate the infiltration points that conventional stitching leaves open to moisture.
• The roll-top closure requires no zip or velcro: fewer components means fewer parts that can break or become clogged with mud and debris.
• The waterproof-coated fabric keeps the bag's weight to a minimum, making it practical as a spare internal liner inside a pack.
• The Medium volume accommodates a full change of clothing or an insulating jacket — the most critical items to keep dry in a thermal emergency.
• The shape adapts to irregular spaces inside a pack without wasting usable volume.