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Osprey Packs
Seral 4L Hydration Pack

4.5 out of 5 stars
2 Reviews
Current price: $55.22 - $72.21 Original price: $84.95
Up to 35% off



Why We Like The Seral 4L Hydration Pack

Whether we are out for a foothill bike ride, quick afternoon hike, or are just swinging the dog around the block we strap-on the Seral 4 Hydration Pack. This pack keeps water nearby at an arms reach so we can stay hydrated.


  • Low profile hipbelt built to keep you hydrated on the move
  • Breathable backpanel locks in a secure and reliable fit while moving
  • 1.5L reservoir keeps you hydrated while you hike, run, or bike
  • Durable material holds up against rugged treks
  • Water-resistant finish fends off light precipitation
  • Zippered main compartment lets you bring just the essentials
  • Magnetic hipbelt bite valve attachment keeps your water nearby
  • Item #OSPZ1A7
Responsible Collection
Bluesign Approved, Recycled/Repurposed
[face fabric] 600D recycled polyester, DWR finish, [accent, bottom] recycled 400D nylon, DWR finish
4L (244cu in)
Hydration Compatible
Reservoir Included
1.5L Hydraulics Lumbar Reservoir
top zip
1 internal zippered
7.5 x 12.5 x 4.5in
Claimed Weight
Manufacturer Warranty

Overall Rating

4.5 based on 2 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 1 reviews
5 Stars - 1 reviews

Fits True To Size

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Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

January 31, 2024

Great minimalist hip pack

I've used it several times

Osprey makes great packs! This hip pack works great if don’t carry all your tools and stuff on a ride. Great for the minimalist!

jacques G
4 out of 5 stars

June 1, 2021

Best in class

I've put it through the wringer
5' 10"

Out of all the hip packs with bladders I've used, I like this one the most. As per most osprey packs, it has an extremely robust and quality build to it. The bladder is clean, easy to use, and lacks the gross plastic taste that comes from a lot of other bladders. The hose is not detachable, which I see no issue in. Full of water and tools the pack doesn't bounce around on my back during descents and I don't notice it at all during climbs. It's easy to grab the hose and drink from it, and then reattach to the magnet. My only gripe about this pack is it's lack of storage space. It seems to have only 1 zipper pocket, which means your storage is shared with your bladder. I would of liked to see some other zipper pockets and some storage that isn't shared with the bladder. Otherwise it's a great pack, and for the $75 price tag I wouldn't go with any other brand. Not to mention ospresy's epic warranty, which keeps me buying their bags time and time again.

Ian C