Filter membrane is sealed never opened and so is everything else comes packaged in zip bags by manufacturer
Waterdrop Gravity Water Filter Straw,with 1.5 gal Gravity-Fed Water Bag
Gravity Water Filter Straw W/3L Gravity-Fed Water Bag|Collapsible Water Bottles
Gravity Water Filter System W/ 2-Gal Bag & 0.1-Micron Water Filter Straw, Gravit
Water Filter Straw,with 3L Gravity Bag Group Camping Water Filter System,5-Stage
Water Drop Portable Water Filter Straw Fitting Gravity Fed Water Bag Blue
