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. Round  bottom optimises space in the backpack side pockets. 

There are two colors: Orange and Blue. Color are random.

Material: Duraflex, 15D Nylon

5L size is useful for electronics gadgets and other quick access items that you want to store in the backpack side pocket.