The Sawyer Squeeze water filter is the most popular filter used by long-distance backpackers due to its ease of use and lightweight quality.

We wanted to get an INSIDE look at the Sawyer Squeeze to see how it really works, so we cut one open and took a close look with a microscope.

Read our series of Sawyer filter reviews:

Review: the new Sawyer Micro Squeeze

Sawyer Squeeze and Micro Squeeze Flow Rate Tests

Should I Carry the Sawyer Syringe?