Waterdrop Gravity Water Filter Straw with 1.5 Gallon Bag
- Item Weight: 0.29 pounds
- Purification Method: Hollow Fiber Ultrafiltration Membrane
- Maximum Flow Rate: 700 milliliters per minute
- Container Type: Bag
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
Choose this when volume and hands-free filtering matter more than a compact single straw, since the 1.5-gallon bag and backwashable filter are built for repeated, larger-batch use.
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ASIN: B086QNLBB4Category: Camping Water Filters
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Overview
The Waterdrop Gravity Water Filter Straw pairs a 0.1 micron five-stage filter with a 1.5-gallon gravity-fed water bag, built for hikers and campers who want to process a full day's drinking water at once rather than sipping straight from a stream.
This is a straw filter scaled up into a small gravity system: fill the bag from a lake or stream, hang it, and let gravity push water through the membrane instead of sucking through a straw the whole time. The attribute copy describes filtration for chlorine, sediment, particulates and taste or odor, not a pathogen claim, so treat it as a taste-and-clarity filter first.
- 1.5-gallon gravity-fed water bag included
- 0.1 micron five-stage filtration membrane
- Flow rate up to 700 ml per minute
- Backwash the straw to restore flow
Who it's for
Best suited to backpackers and campers who want to fill up once and have water ready for a group or a full day, rather than solo day hikers who just need quick sips. It also works disassembled as a straw or connected to bottles for more casual use.
Pros and cons
- 1.5-gallon bag cuts refill trips on the trail
- Detachable ends also work with standard bottles
- Backwashable straw extends usable life
- Rated for up to 1,400 gallons filtered
- Spec covers sediment and chlorine, not pathogens
Performance notes
The 0.1 micron ultrafiltration membrane is rated to reduce chlorine, sediment, particulates and off tastes or odors, with a maximum flow of about 700 ml per minute and a rated lifespan up to 1,400 gallons (5,300 liters) before replacement. The straw backwashes by removing the mouthpiece and flushing it with clean water or a bottle with a 27.5mm thread opening, and both ends detach so it can connect to the included bag or to standard bottles.
Specifications
| Brand | Waterdrop |
|---|---|
| Dimensions & fit | |
| Item Weight | 0.29 pounds |
| Item Dimensions L x W x H | 6.8 × 3.4 × 10.9 inches |
| Capacity & performance | |
| Maximum Flow Rate | 700 milliliters per minute |
| Power & efficiency | |
| Power Source | Corded Electric |
| Construction & materials | |
| Material Type | Hollow Fiber Ultrafiltration Membrane |
| Compatibility & installation | |
| Installation Type | Freestanding |
| Included components | |
| Number of Packs | 1 |
| Unit Count | 1 |
| Warranty & support | |
| Supported Water TDS Level Maximum PPM | 300 |
| Warranty Description | 30 days |
| Other details | |
| Purification Method | Hollow Fiber Ultrafiltration Membrane |
| Container Type | Bag |
| Number of Items | 1 |
| Part Number | WD-FSBUL-1 |
| Other Special Features Of The Product | Gravity Water Filter Straw, Water Purifier Survival |
Frequently asked questions
How much water does the Waterdrop Gravity Water Filter Straw bag hold?
The included bag holds 1.5 gallons, about eleven 500 ml bottles, enough for a full day of group or personal use before refilling.
How long does the WD-FSBUL-1 filter last before it needs replacing?
Waterdrop rates the filter for up to 1,400 gallons (5,300 liters) of use, with a maximum flow rate of about 700 ml per minute.
Can the filter straw be cleaned and reused?
Yes, the mouthpiece detaches so the straw can be backwashed with clean water or a bottle with a 27.5mm thread opening to restore flow when it slows down.