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It's OK to be fanatical.

When you have to get your fix, load up the biker-specific Osprey Zealot 16 Hydration Pack and go out in search of vertical. A generously sized main compartment to hold your gear, touches like a removable roll-out tool pouch and a full-face helmet carrier, and the Osprey Hydraform hydration system make this pack a must-have for downhill fanatics.

  • Airscape suspension features ridge-molded foam that creates a lightweight yet supportive and ventilated back panel
  • Biostretch ventilated harness features perforated EVA straps covered by soft, breathable spacer mesh for maximum breathability
  • Padded spacer mesh hip-wings on the waist belt add carrying comfort and include zippered pockets
  • Hydration sleeve has elastic cord compression to keep water under pressure
  • Hydraform reservoir is BPA- and PVC-free, and features an AquaGuard antimicrobial treatment to prevent growth of bacteria and mold
  • Integral framesheet in reservoir prevents barreling, while a rigid handles allows for easy insertion and removal in the pack
  • 180-degree pivot bite valve rotates on and off in either direction, and includes magnet that attaches to sternum strap
  • Reflective details improve nighttime visibility
  • Zip and drop-in pockets on the shoulder straps keep essentials in easy reach

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Here's what others have to say...

5 5

Love it!

  • Familiarity: I've used it several times

This Hydration pack is the best! It is comfortable, I never notice I have it on my back! The bag has plenty of space, it is big enough to fit everything I need in it with some extra space, while still being the perfect size. The actual hydration pack is fantastics! it holds plenty of water (3L), and it is easy to suck out, also the magnet the nipple sticks to allows easy use. I love how I can easily attach any of my helmets to it. At first I thought it was going to be to expensive but after i got it, and used it, I was very pleased with my purchase. I highly recommend this bag!

5 5

Nailed it

  • Familiarity: I've put it through the wringer

Osprey nailed it with this pack. Plenty of room for pads and helmet outside, while still plenty of room inside and in the pockets for tools, layers, fuel, and 3L of water. The pack rides well even while full on down hills, and the padded shoulder straps are a big bonus on a crash. I'd recommend this pack to anyone looking to be able to carry pads and helmet on the pack for the up.

5 5

Great pack!

  • Familiarity: I've used it several times

I've been using the Zealot for a couple of weeks now and I think it's one of the best packs I've owned. I've used packs from Camelbak, Da Kine, EMS, and others. This has the best features I've found. The tool pocket at the bottom of the pack is large enough to fit all my tools, a tube and my pack pump. The bungee that secures the bladder also doubles a a great spot to hold my first aid kit. The wings are perfect for storing keys and trail food. The non-scratch pocket holds cell phones, glasses, etc at the top of the pack for easy access.

The only complaint that I have is that the pocket on the shoulder strap that's intended for a cell phone isn't large enough to hold most modern smart phones. They could probably do away with that pocket entirely.

5 5

Cross country Rider

  • Familiarity: I've put it through the wringer

I'm not a DHer but I find the capacity for this pack perfect for all day 4+ hour cross-country epics. My last riding pack didn't have room for a decent first aid kit, my SPOT, significant food and water, phone and clothing choices for shoulder season (spring/fall) riding. If you get too small of a pack, all that stuff is wadded up in a hard ball on your back. Ouch!
The intended cell phone pocket on the shoulder strap is too small for an iPhone, probably most of the Samsung models too, but there is a decent small pocket on the back which will also hold your keys in a protected pocket to avoid scratching the phone. Nice. My favorite feature on this pack is the bite valve. New design by Osprey that is really easy on/off, doesn't leak on me while riding and has a really sweet magnetic clip to keep it from swinging and dangling. A really strange thing about this bite's really comfortable to use. You gotta try it to know what I mean.
The counter pull waist belt is a signature Osprey pack feature and much easier to adjust on the fly than traditional waist buckle designs. I'm always trying to find the best pack for my specific needs in different sports and I'm almost embarrassed to say that this is my 6th Osprey among a collection of sport specific packs (skiing, backpacking, cycling, day hiking).
One thing that sort of turned me off when I first got it was that it seemed kind of stiff and unwilling to conform to me. After a 3 days riding with it though it softened up and gave in. Love it. I even used it for some long canyon hikes on the same trip as I got to like it so much.
The roll-up tool pouch in the bottom is trick but I haven't used it yet.

5 5

Love this pack. Osprey know their stuff.

  • Familiarity: I've put it through the wringer

I'm a pretty versatile biker. I'll do anything from rides with 3500' of climbing, a couple Crest shuttles in a day, playing in Moab or lapping Canyons. And I seriously love this pack, it works really well for all of that. The main compartment is the only thing I'd change, it's just a single pocket and it has no kind of dividers or subpockets or anything. I throw a bunch of supplies in there, and it just kinda sucks not being able to organize it at all. Trying to quickly dig to the bottom to get something can be annoying. But that's the only complaint, everything else is awesome. The ingenious stuff like the fold out tool pouch and the magnet on the valve are super convenient. The foam on the back is nice and minimizes sweating there, and the straps are comfortable and forget I'm wearing the pack most of the time. The lidlock works just as it should, and the outer pocket holds a pair of kneepads perfectly.

I'd definitely recommend the pack for any all-mountain/enduro type riders. Big enough to hold all the necessities, but light and comfortable enough to not be noticeable on the long ups or the rowdy downs.

What size RAIN-COVER will fit on zealot16...

What size RAIN-COVER will fit on zealot16 ??
Has anyone used one?

Responded on

Or simply type in: osprey raincover (no spaces) in the search box! You'll see the options.
'XS' fits 600-1200 cu in packs.

5 5

I absolutely love this pack!!!

  • Familiarity: I've put it through the wringer

I bought this for mountain biking but ended up using it for so much more! It truly is a fantastic pack and I would suggest it over any other MTB pack I have seen or used. Love the magnet that holds the mouth piece and the helmet bungy works great! Pockets are a good size but when not needed the pack compresses well.

5 5

Perfect HydroPack

I've owned a few different hydration packs, though this is my first Osprey. I am very impressed with the quality of materials, and the thought that went into the design. The Zealot 10 is probably a better pick size wise for most people, but I have a large frame and it fits my back like a glove. Very comfortable whether crammed full or just carrying some water. Padded, contoured straps make me forget I'm wearing it at times. Very breathable mesh allows my back to catch enough of a breeze that I don't end up soaked. Tons of pockets in ergonomic locations rounds out an amazing pack for bombing hills, dodging cars, day hikes, canoe trips, etc...

5 5

Go to Free Ride pack!

The perfect go to Downhill free ride packs. Fits all your tools and free ride leg pads.

Can anyone compare the functionality of...

Can anyone compare the functionality of the Escapist vs the Zealot 16?

I'm looking for a medium capacity bike specific pack for long XC rides.
It will need to carry some body armor and easy access for layers and tools.

Responded on

If you are carrying body armor ... The Zealot 16 is better choice.

What is the cu in of this pack?

What is the cu in of this pack?
Also, had been riding a "hard-tail" mtn. bike for years, and used a rack/trunk; now have a Trek Fuel EX8, and will have to try a H2o pack system which I have never tried and am wondering about sizing/fit...I'm 5'6" (and not petite): would this size pack probably fit a women? For all day rides (average 20+ mi).
in all but the very worst weather, so I want to be able to pack extra layers, etc. Thanks for helpful advice. ***UP-DATE: I found that the Opsprey *Raven worked out better fit-wise for women...had a chance to try the Raptor 14 & the Raven 14, and I found the Raven to fit much is a little shorter, and the straps do fit a little differently, and that really makes a difference! Thaks all for your advice!

Responded on

Hey Rubicon Ready,

Thanks for the question. The cubic inches on this pack are as follows:

SM/MD: 854 cu in / 14 L.
MD/LG: 976 cu in / 16 L.

Responded on

I am 6', 250 and this pack fits me perfectly. I would probably recommend the Zealot 10 unless you have a ton of gear to haul. It isn't much smaller capacity wise, and I was surprised how large the 16 was when I pulled it out of the box.

Responded on


I found the Raven 14 to be perfect for my needs right now! This pack (or the 10) would be perfect for commuting...probably my next pack.

5 5

Great Bike Pack!

About a minute after starting the first ride using this pack, I completely forgot I had it on! My barometer of whether gear is worth using is if I forget about it.
Took a second to figure out where everything went in this pack. Once I did it made perfect sense. Love the roll down tool pack at the bottom. Great place to keep the weight. The hydration mouthpiece magnet didn't work at first (hose was new & stiff) but after a while it stayed in place. I actually felt a breeze on my back where normal packs were turning my back into soup because of the tight fit. If you're due for a new hydration pack, I highly recommend this pack.

Responded on

Have u tried carrying a fullface helmet and armours on them?
Thanks :)

Responded on

I haven't. Carried my 3/4 helmet with gloves and shades tucked in. Its got a sinch helmet keeper that's adjustable, and great side pockets. Zero question return policy.