Granite Gear eVent Sil Compression Drysacks

The eVent fabric on the bottom is a waterproof, breathable membrane. It allows trapped air to be pushed out when you compress the sack, but prevents water from getting back in, making it much easier to squeeze out bulk without needing a valve.

Yes, they are constructed with waterproof materials and taped seams, and they feature a reliable roll-top closure. While they are designed to keep gear dry in wet conditions, they are not intended to be submerged underwater for extended periods.

The block shape is significantly more efficient for packing inside a backpack. It eliminates the dead space that occurs between round sacks, allowing you to stack them neatly and maximize your internal pack volume.

These sacks are made from 30D Cordura nylon, which balances ultralight weight with impressive tear resistance. While they are lightweight, they are durable enough for standard backpacking use, though you should avoid dragging them over sharp, abrasive rocks.

To get the best seal, roll the top down at least three times before buckling the ends together. This creates a secure, water-resistant barrier that keeps your contents protected.