Ultralight weatherproof organizers. The feather light Zip Pack UL sacks organize all kinds of items and are made of a translucent fabric for excellent overview of contents. Items are easily accessed and viewed through a long zipper opening. Both ends have a handle to ease extraction from within the backpack. The weatherproof YKK AquaGuard zipper and fully taped seams offer excellent weather protection. 5 practical sizes for all kinds of gear.