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  • Osprey Viper 4-Litre Hydration Pack (Supernova, One Size)
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Osprey Viper 4-Litre Hydration Pack (Supernova, One Size)

by Osprey
17 customer reviews

Currently unavailable.
We don't know when or if this item will be back in stock.
  • 2L reservoir
  • Cell phone/MP3 pocket on shoulder strap
  • Bungee lacing system on front panel
  • Volume: 250ci/4L
  • Weight: 15oz/430g

There is a newer model of this item:

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Technical Details


Product Description

Geared for mountain biking, trail running or day hiking the Viper 4 features lock lid helmet clip, top zippered pocket for quick access, elastic sternum strap with magnetic bite valve attachment, cell phone/MP3 pocket on shoulder strap, blinker light attachment, reflective graphics, bungee lacing system on front panel, heat embossed fabric sunglasses pocket and a 2L reservoir.

Product Details

  • Product Dimensions: 5 x 17.5 x 7.2 inches ; 1.5 pounds
  • Shipping Weight: 1.8 pounds
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • Origin: USA
  • ASIN: B0042DL5HI
  • Item model number: 014804-956
  • Average Customer Review: 3.9 out of 5 stars  See all reviews (17 customer reviews)
  • Amazon Best Sellers Rank: #397,789 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
  • Product Warranty: For warranty information about this product, please click here
  • Discontinued by manufacturer: Yes
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Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

21 of 21 people found the following review helpful By GJeff on March 5, 2012
Verified Purchase
I was looking for a great running pack as I am beginning to train for ultras. I looked at just about every hydration system I could get my hands on including the Camelback, Nathan and Osprey systems. Even looked at running belts like the Amphipod.

For me it came down to ease of use, quality of construction and most importantly how it feels while running. A lot of these reviews for Osprey are focused on cycling/mountain biking applications - so I thought I'd add my two cents about using it while running.

The pack itself while empty is incredibly light - remove the hydration bladder on a shorter run and you have a decent amount of room for storing a lot of stuff - because you can also use the compartment where the bladder was.

The pack by itself (no hydration bladder) is 17.5oz according to my scale. The 2L hydration bladder weighs in at 5lbs 4oz when all the way full of water - it would be marginally more if you bled the air out of the supply line when filling. When dry the hydration bladder is around 13oz in weight. All this being said, the hydration bladder sits very close to your back so you end up with a good center of balance.

I have ran at paces from sub 8min/mi on up with a full 2L and it is very comfortable once you get the straps adjusted and cinched out.

I will be using this pack this summer on some of my shorter 5K and 10K races as I have real hydration problems in hot weather due to medical conditions and aesthetically it looks great and is about as minimal as you can go without sacrificing capacity.

The rear storage pocket is great and will accommodate probably 6 or more snack bars with a handy key clip and pocket for your ID (DL, CCs, etc).
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10 of 10 people found the following review helpful By Million Dollar Legs on October 15, 2011
I do a lot of road biking and needed to update my 4 year old Camelbak MULE. I like the MULE, its just a little heavy and clunky (guess that's why its named after a heavy and clunky animal). I have used the Viper on a couple of 40 mile rides and can say that I am thoroughly impressed. Here are some major differences between the 2:

WEIGHT: the Viper 4 weighs about a third of the MULE. The materials are cutting edge, durable yet light. The shoulder straps are a mesh combination that stretches to your shape. This pack is so light and comfortable, I forgot I had it on a couple of times.

HYDRATION PACK: Osprey uses an ingenious reservoir that has a molded plastic spine. This makes it easy to remove and distributes the weight evenly through the pack. The result is much more comfortable when compared to Camelbak's "bag of water" that sits as dead weight at the bottom of the pack.

MAGNETIC CLASP: sounds like a small detail, but being able to release/clasp the hose by just snapping it to your chest make a big difference. The last thing I want to do is fuss with a dangling hose on my rides. The mouthpiece also feels better. The bite valve is made of a softer silicon and feels more solid and better made.

HELMET CLASP: part of my trip is on exclusive bike paths, so being able to get the helmet off and out of the way is important. I did this with the MULE by just strapping it around the pack, but this system works more efficiently.

Osprey has a few models of the Viper. This one is the lightest and is designed for a bare bones kind of trip. It has one zippered pocket tastefully lined with a yellow anti-scratch material for sunglasses and such.
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2 of 2 people found the following review helpful By B. Larrick on June 8, 2012
Size: One SizeColor: Electric Sky Verified Purchase
We live in AZ so its hot. My husband runs medium distance runs up to 15 miles. Most do not provide enough water stations so he always trains with his pack and runs his races with his pack. This is a larger 4L one but it is not so heavy and bulky that you can't run with it. He loves the way the mouth piece has a magnet on it so it is always on his chest and he does not have look down to find it. He also loves that the mouth piece is shaped for your lips so it is easy to drink from and hold in your mouth while running. He loves it and we plan to purchase another one.
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2 of 2 people found the following review helpful By B. DC on January 25, 2012
Size: One SizeColor: Electric Sky Verified Purchase
I had the Osprey bladder that I was squeezing into my old Camelback Rogue. This new Osprey Viper is very easy to remove and fill, and the bladder slips back into the pack with no effort. The only very minor negative is that the hard plastic insert makes the pack a bit wider than my Camelback Rogue, but this pack is a winner.
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1 of 1 people found the following review helpful By D. Torgerson on September 19, 2012
Size: One SizeColor: Supernova Verified Purchase
As the title says, I was a little dissapointed when the product arrived. Maybe I'm an idiot but it looks like it's saying it is a 4 liter pack....it's not. It's a 2 liter pack. It does say 2 liter reservoir in the product details (I see now) which I know that I read so I must've had 4 liter stuck in my head and didn't notice it. The name of the product is the Osprey Viper 4...I still find it a little suspect that they put the "4-liter" in this particular way in the title: "Osprey Viper 4-Litre Hydration Pack"...no other store has it listed this way. I've noticed inconsistant messaging from title, to picture, to product details, to product description quite a bit more than I'd like from amazon particularly in sporting goods so that you don't know which info is correct at times. It doesn't take away from it being an awesome product at a good price (or it was when I bought it), but it was definately a bummer when it arrived and I realized it was half of what I expected so just be aware:) "Osprey Viper 4" and then "Liter pack?" How many liter pack? I just noticed that they did that to the title of the viper 4, 7, 10, and 13 too so no mistake. The 4 is close enough to be believed is the problem, and I might be mistaken but I think only the 4 and 7 were available when I ordered mine. On the Raptor, they title it "Osprey Raptor 4 Daypack" so they would've been WAY better off labeling it Osprey Viper 4 Hydration Pack but I digress:)

It's been a great pack, the Osprey brand in general feels more solid and well built to me than Camelback. The rare earth magnet is a GREAT feature- it keeps the mouth piece right where you need it for quick grabs and replants which is really nice for the mountain biking that I mostly use this for.
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