The verdict
The GravityWorks 4L is the group pick — best for filtering large volumes hands-free for multiple people.
Strengths
- +4-liter capacity — best for groups
- +Gravity-fed (hands-free)
- +Fast filter rate
- +Filters directly into water bottles or cookware
Watch-outs
- −Bulky for solo trips
- −Most expensive
- −Two-bag system to manage
How it compares
Best for groups. Gravity-fed. Most expensive.
Who this is for
At a glance: backpacking groups of 3+.
Why you’d buy the Platypus GravityWorks 4L
- 4-liter capacity — best for groups.
- Gravity-fed (hands-free).
- Fast filter rate.
Why you’d skip it
- Bulky for solo trips.
- Most expensive.
- Two-bag system to manage.
Rating sources
Our 4.6 score is the average of these published ratings. More about methodology.
