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Mystery Ranch
Pack Fly

4.756410256410256 out of 5 stars
78 Reviews
$40.00 - $45.00



Pack Fly

The last thing you want when you're miles and miles from the nearest road is a pack full of wet gear. With the Mystery Ranch Pack Fly you'll be able to keep all the contents of your pack nice and dry through down-pouring rain. Available in three different sizes and accommodating packs all the way from 25-105L, it's perfect for everything from quick day hikes to multi-week backpacking missions. A built-in pocket ensures that you can have quick access to snacks and gear that would otherwise be stuck hiding in your pack, and also doubles as a stuff sack when blue skies return and it's time to tuck the fly away for (hopefully) another day.


  • Lightweight and packable rain cover to keep gear dry as you hike
  • Durable and protective fabric guards your gear from rainy weather
  • Built-in pocket lets you keep important items within easy reach
  • Pocket doubles as a stuff sack when sunny weather swings back around
  • Different sizes accommodate packs from 25-105L
  • Item #MYT003D
Pack Size
[small] 25-45L, [medium] 45-70L, [large] 70-105L
Claimed Weight
[small] 3oz, [medium] 3.7oz, [large] 5oz
Manufacturer Warranty

Overall Rating

5 based on 78 ratings

Review Summary

1 Stars - 1 reviews
2 Stars - 0 reviews
3 Stars - 4 reviews
4 Stars - 7 reviews
5 Stars - 66 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

December 17, 2023

It's a pack fly

Honestly, I've never used it yet but I did put it over my Bridger 35 and it fit. It's a rain cover. My biggest complaint is that it's a pain when trying to fold it back to store it. Like another viewer said, it's best to have it or something similar in case you get caught out in some adverse weather conditions.

P role

Originally reviewed on

4 out of 5 stars

December 9, 2023

Fits well, nice quality.

Glad that I got these for our day packs. After a few days of use in the rain they are quite water resistant. The only draw back is when the rain runs off your jacket into the bottom of the cover it doesn't have drain holes. That was quickly fix by installing 3 eyelets across the bottom.


Originally reviewed on

5 out of 5 stars

December 4, 2023

Still Dana Design

Great product, pricey, but worth it to keep your kit dry


Originally reviewed on

5 out of 5 stars

October 29, 2023




Originally reviewed on

5 out of 5 stars

September 3, 2023

Great product

This fly is exceptional. Everything one would expect from Mystery Ranch. Another outstanding product. Zac

Zac Bembenick

Originally reviewed on

5 out of 5 stars

August 18, 2023

Does what it is designed to do

Fits well and seems fairly durable. Luckily I have not had to use it yet, but I have the confidence that it will when needed.


Originally reviewed on

3 out of 5 stars

July 10, 2023

Why is this a stand-alone purchase?

No issues with this product to date. Its ability to fold into its own pouch is a handy feature. I just don't understand why this isn't included when you purchase one of Mystery Ranch's backpacks.


Originally reviewed on

5 out of 5 stars

June 23, 2023

Buy the fly

Simple product but well-made and a perfect fit. Ingenious integrated stuff sack. Pass on the generic junk and buy genuine MR accessories.


Originally reviewed on

5 out of 5 stars

June 2, 2023


Purchased a medium to go along with my Bridger 65 size medium and it worked well on my first hike with the pair when I ended up in a downpour and then on and off rain and drizzle. I had my tent strapped under the pack and the medium rainfly still wrapped fully around everything, although I did not have the pack filled to the brim. Everything stayed dry and the pack fly felt durable and was not billowing out anywhere to be caught on branches etc. I have confidence in it lasting quite a long time. I've trekked through Nepal, the Rockies, the PNW, and now around the blue ridge and always used inferior products for rain protection (garbage bag, jacket thrown over my pack, etc.) and am now glad to have a nice, better-functioning solution. Thanks for a great product!


Originally reviewed on

4 out of 5 stars

May 23, 2023

Looks good and will do what it is designed to do.

Looks like good material and it will preform as expected. I have not used it yet but intend to.


Originally reviewed on