- 4-liter men's hydration pack ideal for mountain bikers, hikers, and runners
- Ventilated spacer mesh back panel and BioStretch harness sized for man's torso
- Removable 2-liter Nalgene hydration reservoir fits inside dedicated compartment
- Stretch mesh harness pocket for cell phone/snacks; bungee lacing system
- LidLock helmet clip system; measures 8 x 17 x 3.5 inches (W x H x D)
Product Features |
Product Description
Amazon.com
The Viper 4 hydration pack is lightweight and sleek, with 250 cubic inches of space dedicated to your bike gear and accessories. The compact size and easy maneuverability make it ideal for recreational mountain biking, day hiking, and running.
The Viper 4 is equipped with a ventilated spacer mesh back panel that comes in a longer torso size customized for a man's body type. The pack's built-in BioStretch harness and detachable webbing hipbelt, meanwhile, help distribute weight evenly across your frame. As a result, the pack won't weigh you down even as the miles stretch into the dozens. The harness includes a built-in magnet for quick bite-valve attachment, while the hipbelt offers a straight ErgoPull closure to ensure a secure fit.
 The Viper 4 includes a mesh pocket on the harness for an MP3 player or cell phone. |
To guarantee hydration while on the trail, the pack comes with a 2-liter Nalgene engineered HydraForm reservoir that fits inside a dedicated HydraLock hydration compartment. The HydraForm reservoir is simple to remove, clean, and fill, with a rigid handle and large-mouth cap. Cyclists will also love the Viper 4's variety of bike-specific features. The LidLock clip system, for instance, makes it a breeze to attach a bike helmet to the Viper 4, so you don't have to waste space inside the pack. Plus, the pack offers several dedicated compartments perfect for carrying pumps, bike tools, or general items. The options include a stretch mesh pocket on the shoulder strap for a cell phone or snack; a quick-access top zippered pocket lined with a soft, easy-to-clean heat-embossed fabric (perfect for sunglasses or electronics); and a bungee lacing system on the front panel.
Other features include a blinker light attachment, an internal key clip, and reflective graphics.
Specifications:
- Dimensions: 8 by 17 by 3.5 inches (W x H x D)
- Capacity: 250 cubic inches/4 liters
- Weight: 15 ounces
About Osprey
Things at Osprey move full circle, starting with the people, then the product, and then back to the people for the full lifetime of the product. Headquartered in Cortez, Colorado, in the southwest part of the state, the company is nestled at the corner of the rugged San Juan Mountains and on the edge of vast sandstone canyon country. This landscape provides the Osprey staff with constant inspiration and a superb testing ground for the company's packs. The remainder of the company--including Osprey founder and head designer Mike Pfotenhauer--resides in Ho Chi Minh City, Vietnam. In HCM City, surrounded by heat, endless bustle, and vibrant energy, Osprey designs and builds its packs to exacting standards. Living in HCM City provides many benefits, including the ability to create face-to-face relationships with the factories that build its packs, ensure fair labor standards, and soak up the design inspiration of a cosmopolitan city.
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
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Customer Reviews
Most Helpful Customer Reviews
4 of 4 people found the following review helpful
Amazon 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). As the weather starts to get better I will probably be stashing a small camera (Olympus PEN with a pancake lens) for pictures while out on the road. I use the front shoulder strap pocket for stuffing in two energy bars which enables me to eat on the go. It would be real easy to attach an extra pouch on the waist belt (like the amphipod) if you needed more quickly accessible storage up front. I should probably note that the waist belt is removable, but I would recommend it for running - I did try it without the belt and it felt much more secure with the belt in place - YMMV.
The supply hose attachment with the magnet is brilliant and really works quite well. Bite valve works really nicely and enables just the right flow rate.
Other thoughts - there is a small set of loops at the back and bottom of the pack which I attach my Planet Bike taillight flasher for extra visibility when out on the roads - there is a horizontal and vertical loop which should accommodate most any flashing light assembly. I haven't used the bungees on the back of the pack yet, but they would work great for stashing an extra layer. I have worn this with multiple layers and a running jacket and have not had chafing or thermal issues - so it does breathe and ride well on your back - even at long running distances.
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). As the weather starts to get better I will probably be stashing a small camera (Olympus PEN with a pancake lens) for pictures while out on the road. I use the front shoulder strap pocket for stuffing in two energy bars which enables me to eat on the go. It would be real easy to attach an extra pouch on the waist belt (like the amphipod) if you needed more quickly accessible storage up front. I should probably note that the waist belt is removable, but I would recommend it for running - I did try it without the belt and it felt much more secure with the belt in place - YMMV.
The supply hose attachment with the magnet is brilliant and really works quite well. Bite valve works really nicely and enables just the right flow rate.
Other thoughts - there is a small set of loops at the back and bottom of the pack which I attach my Planet Bike taillight flasher for extra visibility when out on the roads - there is a horizontal and vertical loop which should accommodate most any flashing light assembly. I haven't used the bungees on the back of the pack yet, but they would work great for stashing an extra layer. I have worn this with multiple layers and a running jacket and have not had chafing or thermal issues - so it does breathe and ride well on your back - even at long running distances.
2 of 2 people found the following review helpful
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. I was able to easily fit an extra tube (wrapped tightly and taped with tire levers), Co2 mini pump, extra Co2 cartridge, mini tool, patch kit, and a Clif bar. If you use a saddle pouch (which I don't), then this frees up this pocket for you. If you want an extra big pocket for different kinds of trips, or weight is not so much of an issue, get the Viper 7 or 10.
Overall, I was surprised with how much of a difference this light little pack made for my rides. It is perfect for a comfortable 40 or so mile trip in decent weather without refilling. You can always refill it on the trail if you need to, or pair this with a couple of water bottles for those long rides. Osprey also has a lifetime warranty on their stuff, so get this pack, its worth it!
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. I was able to easily fit an extra tube (wrapped tightly and taped with tire levers), Co2 mini pump, extra Co2 cartridge, mini tool, patch kit, and a Clif bar. If you use a saddle pouch (which I don't), then this frees up this pocket for you. If you want an extra big pocket for different kinds of trips, or weight is not so much of an issue, get the Viper 7 or 10.
Overall, I was surprised with how much of a difference this light little pack made for my rides. It is perfect for a comfortable 40 or so mile trip in decent weather without refilling. You can always refill it on the trail if you need to, or pair this with a couple of water bottles for those long rides. Osprey also has a lifetime warranty on their stuff, so get this pack, its worth it!
1 of 1 people found the following review helpful
Color Name:Electric Sky| Size Name:One Size|Amazon 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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