Through 5/16, this pack of three LifeStraw Personal Water Filters, listed at $74.97, drops from $49.99 to $38 when you enter our coupon code BD38 at checkout at Proozy. Plus shipping is free. This is the lowest price we could find for this quantity by $7. These water filtering tubes can filter up to 1,000 liters of drinking water, removes 99.99% of waterborne bacteria and 99.99% of waterborne protozoan parasites. Sales tax is charged in most states.