We use two different weights of waterproof fabrics in this pack cover - the body is a lighter coated nylon and the bottom part is made of a heavier coated nylon so it can handle the abuse of setting your pack down on rough and rocky terrain.
70 denier Ripstop on the main body
210 denier base for extra durability
With four Hypalon loops for external gear attachement
Contoured to fit the shape of internal frame packs
Fitted with a drawcord loop around the opening to ensure maximum protection from driving rain