Personal Water Filter Straw S1 4 Pack Blue
A high-capacity 4-pack of survival straws for ultralight hikers and emergency prep.
Full manufacturer title
Membrane Solutions Personal Water Filter Straw S1 4 Pack Blue
$30
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Ravvy verdict
93.7 / 100
The Membrane Solutions S1 is a must-buy for budget-conscious adventurers who want verified safety certifications and bottle-compatible versatility in a four-pack format.
- Best for
- backcountry hikers, international travelers, and disaster preparedness kits
- Buy it if
- You want impressive 1,320-gallon filtration lifespan.
- Skip it if
- You are people needing to remove dissolved minerals or salt from water.
- Best alternative
- ZeroWater Official Replacement Water Filter Removes PFOA/PFOS 2-Pack (purity enthusiasts and households with high levels of dissolved solids)
How it scores on what matters
- Portability98.0
- Longevity95.0
- Filtration Precision91.0
- Versatility88.0
- Flow Rate82.0
Ravvy factor scores, 0 to 100, derived from specs, owner reviews and category norms.
What it is
The Membrane Solutions S1 Personal Water Filter Straw represents a significant value for those needing reliable water purification without the weight. Weighing only 2 ounces, this 5-stage filtration system utilizes a 0.1-micron hollow fiber membrane alongside activated carbon to strip away 99.9999 percent of coliforms and improve the taste of murky water. Unlike basic straw filters, this unit features a 28mm thread, allowing it to screw directly onto standard disposable water bottles or gravity bags for more versatile hydration options. Durability and longevity are the standout features here, with each straw rated for a massive 1,320 gallons of use. The inclusion of NSF certifications for lead-free materials and microplastic reduction provides a level of scientific assurance that is often missing from budget-oriented outdoor gear. While it does not lower TDS levels, it effectively bridges the gap between a simple emergency tool and a primary filtration device for extended backcountry trips or international travel where tap water quality is questionable.
Ravvy AI insight
Compared to the industry leading LifeStraw, the S1 provides superior value by including four filters for a similar price point and adding a 28mm thread for bottle attachment. Note that while the 5,000-liter capacity is impressive, real-world performance depends heavily on water turbidity, so regular backflushing is essential to maintain the 500ml per minute flow rate.
Generated from owner feedback, product specs, pricing, and retailer data. Last updated Aug 25, 2026.
What owners praise
- Impressive 1,320-gallon filtration lifespan
- Versatile 28mm threading for bottle attachment
- Independently certified to NSF/ANSI standards
- Ultralight at just 2 ounces per straw
- 5-stage filtration improves taste and odor
- Excellent value in a four-pack bundle
What to know first
- Does not reduce TDS or salinity
- Requires significant suction for the first use
- Flow rate slows quickly in very silty water
Specifications
- UPC
- 850071881745
- GTIN
- 850071881745
- Brand
- Membrane Solutions
- Capacity
- 1320 gallons
- Material
- Plastic
- Brand Name
- Membrane Solutions
- Model Name
- gear
- Unit Count
- 4 Count
- Item Weight
- 2 ounces
- Part Number
- water filter straw
- Manufacturer
- Membrane Solutions
- Model Number
- water filter straw
- Power Source
- Non Electric
- Material Type
- Plastic
- Container Type
- Bag,Bottle
- Number of Items
- 4
- Number of Packs
- 4
- Installation Type
- Personal Container
- Maximum Flow Rate
- 500 milliliters_per_minute
- Product Dimensions
- 8.1"L x 2.2"W x 1.6"H
- Included Components
- User Manual
- Package Information
- Bag,Bottle
- Purification Method
- 5-Stage: Hollow Fiber Ultra Membrane, Activated Carbon Filter, Double PP Cotton Fiber, Coarse Filter
- Warranty Description
- 1-year warranty from the date of purchase
- Item Dimensions L x W x H
- 8.1"L x 2.2"W x 1.6"H
- Global Trade Identification Number
- 00850071881745
- Supported Water TDS Level Maximum (PPM)
- 1000
How to get the most out of it
Priming the Filter
Before your first sip, submerge the bottom of the straw in water for about 30 seconds. This hydrates the membrane and makes it much easier to draw water through the straw.
Ownership tips
care
Cleaning and Backflushing
Blow through the mouthpiece after each use to clear out debris. Periodically use a clean syringe or a threaded bottle with clean water to force water backward through the filter to maintain flow rate.
tip
Bottle Compatibility
Use the threaded end to attach the straw to a standard 28mm plastic soda or water bottle. This allows you to squeeze the bottle to force water through the filter, which is easier than sucking through the straw.
Frequently asked questions
Does this filter remove viruses?
This filter is designed to remove 99.9999% of bacteria and protozoa, but it is not rated for virus removal. If you are in an area with known viral contamination, you should use chemical treatment or boiling in addition to the straw.
Can I use this for saltwater?
No, this straw is designed for freshwater sources like lakes, rivers, and taps. It will not remove salt from ocean water and attempting to do so will damage the membrane.
How do I know when the filter needs replacing?
The filter will reach the end of its life when the pores become completely blocked. You will notice the flow rate significantly decrease until it is impossible to draw water through the device.
Does it have an expiration date?
If kept dry and stored in a cool place, the filters do not have a specific expiration date. This makes them ideal for long-term storage in emergency kits or bug-out bags.
Where can you buy the Personal Water Filter Straw S1 4 Pack Blue?
Personal Water Filter Straw S1 4 Pack Blue is sold through Amazon, and Membrane Solutions also lists it through its own site and major retail partners. The buy link on this page goes straight to the current Amazon listing, which is where stock and pricing update most often.
How much does the Personal Water Filter Straw S1 4 Pack Blue cost?
The last price Ravvy recorded was $30. Retail pricing on water filtration moves with promotions and stock, so treat that figure as a reference point and check the live listing before you buy.
How do you get the Personal Water Filter Straw S1 4 Pack Blue for a cheaper price?
Three tactics work best: watch for holiday and seasonal sale events when water filtration discounts run deepest, compare the open box or renewed listing against new stock, and check whether Membrane Solutions is running a coupon or bundle. Adding the product to your Ravvy wishlist keeps it handy so you can revisit the listing when prices drop.
Is the Personal Water Filter Straw S1 4 Pack Blue in stock right now?
It was in stock at our last check. Availability on popular water filtration can change within hours, so the live listing is the source of truth.
Is the Personal Water Filter Straw S1 4 Pack Blue worth it?
Ravvy scores it 93.7 out of 100. The strongest argument for it is impressive 1,320-gallon filtration lifespan. The trade off to weigh is does not reduce TDS or salinity.
Who should buy the Personal Water Filter Straw S1 4 Pack Blue?
It fits backcountry hikers, international travelers, and disaster preparedness kits If that does not describe your situation, compare it with the other options in Water Filtration before committing.
What are the key specs of the Personal Water Filter Straw S1 4 Pack Blue?
UPC: 850071881745. ASIN: B07SYYQZDN. GTIN: 850071881745. Brand: Membrane Solutions.
What are good alternatives to the Personal Water Filter Straw S1 4 Pack Blue?
Compare it against the other scored picks in Water Filtration on Ravvy. We rank every option in that group by the same criteria, so you can see which model wins on value, quality, and owner sentiment before you decide.
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