Drysack / Drybag from 3F UL Gear is made of 15D Ripstop nylon with taped seams. A drybag can be used in many ways, mainly to keep your equipment dry and act as a protection. Good to have with you when you hiking in rain or river crossing. Rectangle bottom optimises space in the backpack better then round bottom. 

There are two colors: Orange and Blue, and in two different sizes: 6L, 12L. Color are random.

Material: Duraflex, 15D Nylon

12L - Great for sleep system (0c Iceflame quilt Strap LightTour Mattress Pillow Naturehike liner Base layers Down socks Down hood)

6L - Great for spare clothes electronics.