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LifeStraw Peak Gravity 3L Review

A sleek and durable design with a ton of versatility and fast flow rate, offered at a more affordable price
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LifeStraw Peak Gravity 3L Review (The opening of the LifeStraw Peak Gravity is a little difficult to fill in shallow water.)
The opening of the LifeStraw Peak Gravity is a little difficult to fill in shallow water.
Credit: Trinity Robinson
Price:  $66 List
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Manufacturer:   LifeStraw
By Trish Matheny ⋅ Review Editor  ⋅  Nov 3, 2022
73
OVERALL
SCORE


RANKED
#5 of 23
  • Water Quality - 20% 8.0
  • Durability & Maintenance - 20% 8.0
  • Treatment Time - 15% 6.0
  • Weight & Packability - 15% 6.0
  • Ease of Set Up - 15% 8.0
  • Ease of Filtration - 15% 7.0

Our Verdict

If you're looking for a high-quality gravity-fed filtration system available at a more affordable price, the LifeStraw Peak Gravity 3L is the filter for you. Constructed from BPA-free premium materials, this sleek design is durable, extremely versatile, and leakproof, thanks to the included cap. An intuitive and easy setup will have you ready to filter in less than 30 seconds, and the included backwash syringe will restore optimal flow with minimal maintenance. The only drawback to this filter is the opening on the storage bag, which is difficult to fill if your water source is shallow.
REASONS TO BUY
Durable bag
Fast flow rate
Leakproof storage
Easy to maintain
Long filter life
Versatile design
REASONS TO AVOID
Difficult to fill water storage bag in shallow streams

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Bottom Line Designed with versatility and durability in mind, this gravity fed system doesn't disappointThis lifetime guaranteed product is easy to use on the trailA solid option for collapsible bottle filtration during fast and light backcountry missionsThe best chemical treatment option that will kill all pathogens when given enough timeLightweight and easy to use, these tablets can be used as an emergency backup to regular treatment
Rating Categories LifeStraw Peak Grav... Sawyer Squeeze LifeStraw Peak Squeeze Aquamira Water Trea... Potable Aqua Purifi...
Water Quality (20%)
8.0
9.0
8.0
5.0
2.0
Durability & Maintenance (20%)
8.0
6.0
6.0
10.0
10.0
Treatment Time (15%)
6.0
9.0
6.0
2.0
2.0
Weight & Packability (15%)
6.0
8.0
8.0
9.0
10.0
Ease of Set Up (15%)
8.0
7.0
9.0
8.0
9.0
Ease of Filtration (15%)
7.0
8.0
9.0
9.0
10.0
Specs LifeStraw Peak Grav... Sawyer Squeeze LifeStraw Peak Squeeze Aquamira Water Trea... Potable Aqua Purifi...
Measured Weight (entire kit) 8.1 oz 5.7 oz 3.8 oz 3.0 oz 2.3 oz
Removes Particulates (sediment, microplastics)? Yes Yes Yes No No
Effective Against Viruses? No No No Yes Yes
Effective Against Chemicals? No No No No No
Effective Against Heavy Metals? No No No No No
Effective Against Bacteria? Yes Yes Yes Yes Yes
Effective Against Protozoa (Giardia, Cryptosporidium)? Yes Yes Yes Yes Yes (Giardia = yes; Crypto = no)
Type of Filter/Purifier Gravity filter Squeeze, in-line, on-the-go Squeeze Chemical treatment Chemical treatment
Filter Media or Active Ingredient Hollow-core membrane microfilter Hollow fiber Hollow-core membrane microfilter Chlorine dioxide Iodine and Tetraglycine Hydroperiodide
Filter Pore Size (Advertised) 0.2 microns 0.1 microns 0.2 microns N/A N/A
Number of Liters/Gallons per Lifetime (Advertised) 2,000 L / 500 gal 378,541 L / 100,000 gal 2000 L / 500 gal 114 L / 30 gal (per package) 25 L / 6.6 gal

Our Analysis and Test Results

The LifeStraw Peak Gravity is one of the most versatile and durable gravity-fed systems we tested. Simply interchange the microfilter with the LifeStraw Peak Squeeze bottle or place the filter directly into the stream and suck water through as a straw. Our only complaint about this system is the small opening on the storage bag, which can be difficult to fill in shallow water. That aside, an easy setup and a minimalist design will have you filtering water in less than one minute, and a filter life of 500 gallons will keep you hydrated for many adventures to come.

Performance Comparison


lifestraw peak gravity 3l - the lifestraw peak gravity is a durable gravity fed system that...
The LifeStraw Peak Gravity is a durable gravity fed system that doesn't disappoint.
Credit: Trish Matheny


Water Quality


While the Peak Gravity uses a 0.2-micron hollow-core membrane that protects against 99.999999% of bacteria, 99.999% of parasites, and 99.999% of microplastics, silt, sand, and cloudiness, it is not effective against viruses, heavy metals, or chemicals. During our testing period, we were impressed by the overall water quality, which was clear and did not have any lingering aftertaste, even when filtering in turbid water after a few days of thunderstorms.

lifestraw peak gravity 3l - the peak gravity 3l offers excellent water quality, effectively...
The Peak Gravity 3L offers excellent water quality, effectively filtering out bacteria, parasites, microplastics, silt, sand, and cloudiness.
Credit: Trish Matheny

Durability and Maintenance


This metric is perhaps where the Peak Gravity really shines. Constructed from BPA-free, premium materials, and a fully leakproof storage bag, this gravity filter is designed with longevity in mind. Maintenance is easy thanks to the included backwash syringe — simply remove the filter from the storage bag, attach the backflush syringe and submerge it in fresh water while using the syringe to draw water up and down the other side of the filter. After many uses in the field, our testers found that the flow rate would increase after a little maintenance. You know your filter has reached the end of its life if water no longer flows through, even after performing the backwash procedure.

Regarding storage, LifeStraw recommends for storing your filter in a saline solution comprised of one teaspoon of salt in purified water. This will keep the filter from getting drying out and also help retain the hydrophilic properties of the membrane.

lifestraw peak gravity 3l - perform easy maintenance by simply attaching this syringe to the...
Perform easy maintenance by simply attaching this syringe to the microfilter and backwashing with clean water.
Credit: Trish Matheny

Treatment Time


While the Peak Gravity 3L did not offer the fastest nor the most competitive flow rate, one liter per 30-34 seconds ain't bad. However, other comparable gravity filters offer double the flow rate, which may be important to larger groups and base camps.

lifestraw peak gravity 3l - the long hose of the gravity fed system contributes to the treatment...
The long hose of the gravity fed system contributes to the treatment time of roughly 30 seconds per liter.
Credit: Trish Matheny

Weight and Packability


This is one of the lightest and most packable gravity filtration systems we tested. The dimensions of this filter are 8.6 x 20.8 inches, with a hose length of 47 inches. Weighing only 8.1 ounces and packing down to the size of a Nalgene bottle, you won't think twice about bringing this filter along for your next backcountry base camp.

lifestraw peak gravity 3l - one of the lightest gravity fed filtration systems that we tested...
One of the lightest gravity fed filtration systems that we tested, the Peak Gravity packs down smaller than a Nalgene bottle.
Credit: Trish Matheny

Ease of Set Up


An intuitive setup helped the Peak Gravity receive high marks here. The filter comes with only seven parts, which include the storage bag, the hose, a quick connector to attach the filter, a cap that allows for storage, the backwash syringe accessory, and a carabiner and carry strap. The setup and minimalist design took our testers less than 30 seconds to assemble and get ready to filter.

lifestraw peak gravity 3l - simply fill the bag with water and attach the filter and hose before...
Simply fill the bag with water and attach the filter and hose before hanging in a tree to let gravity do the work!
Credit: Trinity Robinson

Ease of Filtration


Unfortunately, we couldn't give the Peak 3L high marks in this metric due to the small opening on the storage bag, which was difficult to fill in shallow water. We had to get creative to fill the bag in shallow streams, while it was much easier to fill when submerged in deeper pools.

Perhaps one of the most notable features of the Lifestraw Peak Series is its versatility. This filter can be used as a gravity system, a straw used to drink directly out of the stream, or attached to the LifeStraw Squeeze bottle.

Steve Mace demonstrating one of the filtering options of the...
Steve Mace demonstrating one of the filtering options of the LifeStraw Peak Series filter while adventuring in the Eastern Sierra.
This photo displays the small opening that can make it tricky to...
This photo displays the small opening that can make it tricky to fill the storage bag in shallow water sources, however, it also increases the versatility of this filter, allowing for the microfilter to attach to the LifeStraw Squeeze bottle and other widemouth bottles of similar size.

Should You Buy the LifeStraw Peak Gravity 3L?


If you're looking for a gravity-fed water filter that offers a sleek and durable design, a long-lasting microfilter, and an easy-to-use, easy-to-maintain setup, the Peak Gravity 3L won't let you down. We love that this filter has interchangeable parts, compatible with other Peak Series components. Available for a fraction of the cost of its gravity-fed competitors, the only drawbacks we found with this filter were the small opening utilized to collect water and the slightly slower flow rate.

lifestraw peak gravity 3l - features that include a burly and durable storage bag and...
Features that include a burly and durable storage bag and measurements to help keep track of water levels make this gravity filter a great choice for extended trips in the backcountry.
Credit: Trish Matheny

What Other Backpacking Water Filters Should You Consider?


If you're interested in other gravity-fed water filters that offer a faster flow rate in exchange for a little more investment, check out the top-rated Platypus GravityWorks and the Katadyn Gravity BeFree 6L.

lifestraw peak gravity 3l - a simple, sleek design that offers quality performance at a more...
A simple, sleek design that offers quality performance at a more affordable price.
Credit: Trish Matheny

Trish Matheny