Platypus GravityWorks 4.0L Filter System

We’ve read the reviews across the web for the Platypus GravityWorks 4.0L Filter System and summarize the results below:

Universal Ranking

PeakScore: 88 (out of 100)
User Rating: 4.4 stars 
Expert Rating: 4.3 stars

Number of Ratings Reviewed: 573

Pros & Cons

Reasons to buy:

User Reviews

  • Effective and reliable.
  • Easy to use and simple to figure out.
  • Convenient due to being able to fill quickly without a pump.
  • Packs down small for easy transport.
  • Filters quickly and efficiently.
  • Buckle on the top of the bag makes it easy to hang.
  • Buying any necessary replacement parts is simple and easy.
  • Filters 4 liters of water in less than 4 minutes.

Expert Reviews

  • Best water filtration option on the market for family backpacking.
  • Easy to clean and takes less than 5 minutes consistently to fill.
  • 8 liters of water in total capacity which is ideal for groups.
  • Easy to fill by dipping the bag into deep water.
  • Quick-disconnect tube attachment for efficiency.
  • Screw-on hose adapter for a secure seal.
  • The bag’s material is durable and long-lasting.
  • The entire purification system can roll up into a bundle for easy transport.
  • Able to integrate with other Platypus accessories for full customization.
  • Filter claims to remove 99.99% of bacteria from the water.

Reasons NOT to buy:

User Reviews

  • Might be more difficult to get water out of a shallow stream due to the bigger bag and filling-up process.
  • Water that is very contaminated can clog the tube.
  • The tubes can sometimes get dirty from debris from very impure water.

Expert Reviews

  • Very dirty water can clog the filter.
  • You can’t allow the filter itself to freeze (as that damages the filter) so you need to bring it in your tent when the temps are very cold.
  • Tube can get ice build up if the tube is not emptied in very cold temps.
  • Does not protect against chemicals or viruses in the water.
  • Expensive cartridge replacement after 1500 liters of water.
  • Filter can be damaged by impacts, so you have to treat it carefully.


The Platypus GravityWorks 4.0L Filter System is a high-quality, intuitive, and very well designed water filtration system for multiple people. Until someone invents an odorless and safe magic pill to purify water, the Platypus GravityWorks 4.0L is likely the best option on the market for cleaning water for groups and families.


Note: User and expert rankings were reviewed across the web. Some expert reviews include these: 1, 2, 3, 4, 5, 6, 7.