Filter membrane is sealed never opened and so is everything else comes packaged in zip bags by manufacturer
Waterdrop Gravity Water Filter Straw, Camping Water Filtration System, Blue
Waterdrop Personal Water Filter Straw with Gravity Water Bag, Portable Camping
Waterdrop Personal Water Filter Straw with Gravity Bag, 0.1 Micron Camping Purif
Waterdrop Personal Water Filter Straw for Hiking, Camping, Travel, 2 Pack
Gravity Water Filter Straw Portable Drinking Water Filter,4-Stage,3L Water Bag
SimPure Gravity Water Filter, Portable Gravity-Fed Water Purifier with 3L Bag...
