Filter membrane is sealed never opened and so is everything else comes packaged in zip bags by manufacturer
Waterdrop Personal Water Filter Straw with Gravity Water Bag, Portable Camping
Waterdrop Personal Water Filter Straw with Gravity Water Bag,Portable Camping
Waterdrop Personal Water Filter Straw with Gravity Bag, 0.1 Micron Camping Purif
Personal Water Filter Straw with 3L Gravity Water Bag, Gravity Water Filter
Gravity Water Filter Straw W/3L Gravity-Fed Water Bag|Collapsible Water Bottles
SimPure Gravity Water Filter, Portable Gravity-Fed Water Purifier with 3L Bag...
