Any of the dry bags that use abrasion-resistant fabrics of 70 Denier or heavier are suitable for true external use.
The Lightweight and View dry sacks, eVac Dry Sacks and 70D eVent Compression Dry Sacks, Stopper, Big River, and Hydraulic dry bags are intended to be used directly outside a backpack.
Any of the lighter dry sacks (Ultra-Sil Dry Sacks or UltraSil eVent Compression Dry Sacks and Ultra-Sil Nano) are only designed for internal use inside another bag or backpack.
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