Open main menu

Guppyfriend Washing Bag

rated 4.5 of 5 stars
photo: Guppyfriend Washing Bag equipment cleaner/treatment

The Guppyfriend helps prevent your fleece gear from spewing micro fibers into the water supply. The concept is pretty simple—a bag with pores too fine to allow micro fibers out, but water gets in during a normal wash cycle to clean your fleece. Cleaning micro fibers out of the bag is a bit of a chore. I have used this a number of times, and it seems durable.


  • Great for the environment
  • Garments get clean
  • Durable
  • Good size for cleaning larger garments


  • Cleaning micro fibers out is annoying
  • Best to remove sticks and brambles first

March 2022 update:

I continue to use this bag to launder fleece. It's effective for washing two medium weight or one thicker/heavier fleece. I washed a fleece top (baselayer-weight) and bottom in it today. I run extra rinse to ensure detergent gets fully removed, and I have been running each fleece 12 minutes in a dryer to damp dry them, then hang them to fully dry. 

To clean the bag, I wait until it dries, turn it inside out, and either shake the lint/residue off or dustbust it. I have used it at least 20 times since the original review, and the bag is in great shape. 


original review:

I read a few articles recently about how detrimental nylon and polyester micro fibers are to fish and other organisms that live in the water, and about how the fleece I wear a lot contributes to this problem. While I like wool layers and sweaters as alternatives to synthetic, wool isn’t as efficient at wicking moisture, takes longer to dry, and often isn’t as durable as synthetic insulating layers, and wool generally feels heavier.  

In search of a simple solution, I found the Guppyfriend washing bag. I purchased it on Patagonia’s website, and it makes sense that a leading maker of fleece would offer a product like this, but this is an independent company as far as I can tell. Profits from the sale of the Guppyfriend go to Stop! Micro Waste and Stop! Plastic Academy.  (Stop! Micro Waste is a non-profit dedicated to avoiding, replacing, and re-using plastics).

There are other similar kinds of bags from other sources and much more complicated solutions, like attaching a special filter to the waste water output from your washing machine.  

Guppyfriend with a men's size XL fleece vest inside

It’s very simple to use. Drop your soiled or smelly fleece inside, zip it shut, wash/dry, or wash and hang the fleece to dry. (I hang all fleece up, hot dryers don’t do fleece any favors). A very soiled fleece with chunks of dirt/stones, brambles, sticks clinging should get hosed down before using the bag, because anything like that will end up stuck in the bag with your fleece.

According to literature I read online, the bag not only catches micro fibers but also reduces agitation forces on your fleece because it’s encased in a bag—which helps preserve your fleece and limit microfiber shedding.

Worth noting that washing fleece in cool water and air drying it helps it shed less micro fibers, so does running fleece in a slower spin cycle and using a front-loading washer.  

The zippered opening is wide enough to easily fit a large fleece garment inside

Cleaning microfibers out of the Guppyfriend is a bit of a chore. When I have used the bag, microfibers don’t tend to collect in clumps—they are scattered about the inner surface of the bag. Shaking the bag out doesn’t work because the fibers tend to cling, so getting the fibers out means using your hands or a small vacuum (dustbuster?) to manually remove the microfiber residue. One solution I have not yet tried is flipping the bag inside out and letting the micro fibers go into the dryer lint trap; I’m concerned repeated heated drying cycles would degrade the bag.  

In case you forget, there is a warning on the bag opening to properly dispose of microfiber waste.

After cleaning it, hang the bag. It dries very quickly.

Clean fleece with now-cleaned bag, drying out

Takeaways? For about $35, you can support a nonprofit organization and a good cause, do your part to improve the environment, and prolong the life of your favorite fleece or other synthetic hiking gear when you clean it. 


Roughly a half dozen wash cycles with stinky or soiled synthetic layers in the bag.

update: now used roughly 20 times.

Source: bought it new
Price Paid: $34.95

About the Author

Andrew Friedman is a New Hampshire native who loves the Presidentials and spent his college summers guiding trips in the Adirondack High Peaks. He loved introducing his children to hiking and the outdoors. In addition to New England and the Adirondacks, he has hiked the shores of the Great Lakes, the Tetons, a number of California's state and national parks, the Albanian Alps, and trails in India, Asia, and the Middle East. Andrew logged his first review on Trailspace in 2007 and joined the Trailspace Review Corps in 2011. Andrew lives and works in the DC metro area.

Your Review

Where to Buy

Help support this site by making your next gear purchase through one of the links above. Click a link, buy what you need, and the seller will contribute a portion of the purchase price to support Trailspace's independent gear reviews.

You May Like


Price MSRP: $34.95
Current Retail: $34.95
Historic Range: $29.75-$34.95
Reviewers Paid: $34.95
Size 29.1 x 19.7 in / 74 x 50 cm
Material polyamid 6.6 untreated
Product Details from Guppyfriend »

Recently on Trailspace

Patagonia Light Farrier's Shirt Review

Patagonia Iron Forge Hemp 5-Pocket Pants Review