Bottom compartment compatible: 20 liters (for backpacks with a volume of approximately 35 liters or more). Loop at the bottom for hanging. Roll closure: Roll down at least three times before closing the buckle to keep the contents dry. Caution: not suitable for situations where the dry pack is submerged in water. Material with a 10,000 mm water column protects against dust or heavy rain. D-ring for attachment. Sealed seams. Efficient packing thanks to the rectangular bottom shape.