Osprey Seral 4 Hydration Waist Pack
With its slim design and next-gen reservoir, the Osprey Seral 4 waist pack is for riders looking to hit the trail with low-profile, integrated hydration while keeping snacks and a spare close at hand.
- PFAS-free durable water repellent (DWR) finish
- Includes an Osprey Hydraulics 1.5-liter lumbar reservoir with a strong, magnetic hipbelt bite valve attachment
- Large zippered main compartment with internal reservoir sleeve, tool organization and zippered pocket
- AirScape back panel with contouring lumbar wrap provides maximum stability
- Blinker light attachment with reflective graphic (light not included)
Imported.
View all Osprey Cycling Hydration Waistpacks| Best Use | Mountain Biking |
|---|---|
| Gear Capacity (L) | 4 liters |
| Gear Capacity (cu. in.) | 244 cubic inches |
| Reservoir Compatible | Yes |
| Reservoir Included | Yes |
| Bottle(s) Included | None |
| Liquid Capacity (fl. oz.) | 50.7 fluid ounce |
| Liquid Capacity (L) | 1.5 liters |
| Weight | Unavailable |
| Fits Waist/Hips | 26-50 inches |
| Material(s) | 600-denier recycled PET packcloth (bluesign®-approved) |
| Number of Exterior Pockets | None |
| Pack Access | Panel |
| BPA Free | Yes |
| Gender | Unisex |
| Sustainability | Contains materials that meet the bluesign® criteria Contains recycled materials |
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Most Helpful Critical Review
Water comes out of water bag
Love the way this fits on my waist very comfortable. Only drawback is that bag leaks and I can’t figure out where it is coming from. Therefore, I have to put water bag inside a ziplock so it doesn’t wet other items in my bag
hydration system is flawed
This arrived last week. I used it for the first time yesterday. Water spilled out of the hydration pack and into the pack itself, soaking my keys and phone. When I got back home there was a tear in the top of the hydration reservoir, where the clip closes the fold over top. The reservoir was below the max fill line. The fold over clip top does not close or open easily. The pack itself is difficult to open and close when the reservoir is in the pack. There is really only room for keys if the reservoir is in the pack. I love the colors. I love the design of the pack: the back air space and the materials and the zippers. The hydration pack does not fit with this bag.
Shower anyone?
The pack itself is nice, with good features, and enough space for essentials without being bulky, but unless you want a constant lumbar shower, I recommend looking for a different hydration system. I own several Osprey backpacks and the quality is great. I have not had luck with their hydration systems. The other problem is that the bite valve cover flops off constantly, it's too big for the valve. Improvements are needed. I wanted to like this, but it's going back.
It does the job
On the whole I love Osprey products and know that I am buying a quality product. I can tell that everything will stand the test of time and it is reasonably comfortable. The smaller pocket is great for tools that I would otherwise loose on the trail and it has a good form factor to cram stuff into. My few annoyances with the product are that the pocket for the reservoir sits higher in the pack than I would have as ideal. This creates a weird bulge on your back and also makes it harder to fully utilize space. Additionally, the hip straps are not very long and do not hug as much as pinch. I have a standard waist size and they barely reach my mid hip bone. I would have loved to see a slightly wider pack or longer pads.
Great Pack!
This pack is great for short excursions. While it is a biking pack, I use mine for short hikes and snowshoeing. It has been awesome to use while recovering from a shoulder injury. It has enough room for water, snacks, and small essentials. I moved the mouthpiece closer to the belt buckle because it would disconnect from the magnet constantly when you move your arms. Also, a mesh pocket in the front would be great to quickly stash and access a cell phone. My biggest disappointment with this pack is the lack of a reservoir cleaning kit. It is very inconvenient to clean the small reservoir and dry it out. I end up using multiple reusable straws to poke into the reservoir to keep it open and allow air flow and get it dry. Would love to see a proper drying rack.
Great size but lacks the ideal tube output
Love this lumbar waistpack for the size, comfort and zipper pocket but there is a key missing feature to allow proper hose management - a purposeful opening to enable the hydration system tubing to emerge from the pack without leaving the zipper pocket open. The 'updated' magnetic coupling fails to hold the tube in place which results in frequent dangling down. Taking a page from hiking backpacks would have this elevated this design and usability. Not worth the price tag.
Excellent warm weather biking bag
Fits like a glove, holds the essentials, has room on the strap to attach a small camera case, does not get particularly hot, thanks to air flow construction. Used on a bike tour of Cambodia (85-95 degrees F) and on day rides in New York (40-50 degrees F). Never used it as a hydration pack. Removed the bladder immediately. Instead carried sunglasses, large smartphone, snacks, small tube of sunscreen, passport, cash, electrolyte drink mix packets, bike multitool.
Right equipment for the job
I purchased the Seral 4 for mountain biking. I was looking for a hydration pack that could carry the necessary fluids and have room for the essentials; keys, cell phone, small assortment of tools and some type of power bar. The Seral 4 is quite accommodating, not overly big or bulky. I have been using the pack for over three months and have zero issues. The perfect bag for my one/ two hour ventures on the bike.
Not a fan
I have five Osprey packs and have had others in the past. None have disappointed until the Seral 4. Most disturbing, the taste from the hydration pac is unbearable. The company advised my to fill it with water and lemon juice and freeze it. One, this should not be necessary, two, if they have the solution then they know they have a problem, and three, it didn't work. Many washes and soaks later it is tolerable with a drink mix but not with plain water. The hydration pac also is also very awkward, is sectioned oddly, is difficult to get into the pack, and doesn't fit well. And if it's full, there is very little space left in the pack. The pack itself is ok, but there is a very low volume pack. Water, a snack, keys, and a phone is about it. Perhaps very limited repair gear. Advantage: low on the back so low center of gravity and not hot in the summer. This does create a very long hydration tube and a somewhat awkward attachment system for that. I may use this some but will likely go back to my full size back hydration pack.
I grabbed this to wear
[This review was collected as part of a promotion.] I grabbed this to wear at a race versus my backpack so I had more airflow. It fits great and is easy to cinch down to keep it from flopping after drinking some water out. Excellent product. Highly recommend.