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Platypus Big Zip EVO Reservoir

$36.95 - $39.95

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Big Zip EVO Reservoir

Offering a faster-than-ever flow rate and the same taste-free hydration you've come to expect from Platypus, the Big Zip EVO reservoir has your back on hot days of outdoor adventuring. Whether you're hiking to your local lookout or mountain biking your favorite trails, the improved flow rate and self-sealing Bite Valve valve make it easy to get hydration when you need it, while the leak-proof shutoff valve, handy grip, and secure SlideLock make it easy to operate. Plus, thanks to Platypus' clean taste guarantee, along with embedded Silver-ion to keep away mold and bacteria, you can have peace of mind as you hydrate yourself on countless adventures.

  • Hydration reservoir with a clean taste and quick flow rate
  • Self-sealing bite valve improves flow for more effective hydration
  • Silver-ion treatment protects clean water from mold and bacteria
  • Leak-proof shutoff valve prevents leaking in your pack
  • Sliding lock and one-handed pincher grip make it easy to fill
  • Item #CAS00FO

polyurethane, polyethylene
1.5L, 2L, 3L
[1.5L] 13 x 8.5in, [2L] 15 x 8.7in, [3L] 17.2 x 9in
Claimed Weight
[1.5L] 5.6oz, [2L] 6oz, [3L] 6.5oz
Recommended Use
hiking, biking, running
Manufacturer Warranty

Tech Specs

What do you think about this product?


>Rating: 3

I loved it at first - but leaking issue

I've put it through the wringer
True to size

I've used this bladder a ton and loved it initially - SUPER easy to fill with water and lock into place using the zip method. It also didn't taint the taste of the water nearly as much as some other reservoirs I've tried. But after a few uses, the mouthpiece started leaking - nothing dramatic, but just a small dribble. It lessens when the valve is shut, but opening and closing it all the time actually isn't that easy nor is it convenient. I went online and sadly discovered on other sites besides Backcountry that this is a common issue with their valves. Bummer! My buddy has an Osprey bladder that uses a similar zip-full technology but has never had an issue with leaks, so I'm going to try that.

I think it's supposed to leak from the mouthpiece. Into your mouth :D

>Rating: 5

Platypus Big Zip EVO Reservoir

I gave it as a gift but have feedback to share

I have as a gift, but have feedback to share. One thing I have always loved about platypus that keeps me coming back for more is the clean taste of the water. The Platypus Big Zip EVO Reservoir is true to form. Plus, I love the added feature in the inside to help the bladder have a lower profile, making it easier to load in my pack.

>Rating: 5

Great Hydration Reservoir for backpackin

I've put it through the wringer

Wow...the Platypus Big Zip EVO 3.0 Liter performed great on my 2 week backpacking trek to Philmont Scout Ranch this past June. In fact, I was able to drink our good city water the first 3 days before I had to fill it up again. I have used other reservoirs before and some can easily leak or come "unzipped" at inopportune moments. Not the Platypus! It performed like a champ. Not a single leak the entire two weeks and the water tasted great the entire time. Great flow rate once you bit down the right way on the bite valve. And what was really great was the volume of water I could carry that stayed cool the entire time. With 3 liters insulated by camping gear, and temps at night in the 40's, I enjoyed cold water each day. Unlike what I would have experienced with water bottles that heat up quicker. I would highly recommend this reservoir. It is very easy to fill and the parts come off and go on very easily.

>Rating: 5


I've used it several times

The hose attachment at the top of the bladder makes it easier to load, especially in a external pack sleeve. The hose is slightly larger than average, which is supposed to make the flow rate faster. Very easy to fill.

>Rating: 5

Perfect for All Outdoor Activities!

I've used it several times

I bought this Reservoir for touring in the backcountry and love it! Highly recommend for touring and hiking.


Will this fit the newest Osprey Xenith 75L?


Is it possible to attach an inline water filter to the EVO reservoir . SAwyer mini etc.


BPA free?

Hey Jean, all materials in this item are certified taste-free, BPA-free, BPS-free, and phthalate-free.