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Supportive, comfortable, and packed with pockets for your grueling hike or mountain bike ride.

Get your mountain bike or hiking gear together with the Osprey Manta 28 Hydration Pack. Designed for solid daylong adventures, the Mantra 28 incorporates tons of thoughtful details to keep you comfortably on the move. Just to name one, the magnetic hose attachment makes your bite valve accessible from any angle so you don't have to play an extended game of tag with your hose.

  • Airspeed suspension features a mesh backpanel supported by a LightWire frame with side vents and ridge foam backing for comfort, support, and ventilation
  • Stretch sternum strap has a magnetic hose attachment for your reservoir bite valve
  • BioStretch harness features a ventilated design that's cool and comfortable
  • Hip-belt with a modified-straight ErgoPull closure keeps the Manta 28 stable and transfers load effectively
  • 28-liter pack holds everything you need for a strenuous or leisurely day hike in the mountains
  • Wide panel offers easy access to the main compartment
  • Durable, strong nylon and polyester fabrics provide longevity
  • Integrated raincover for all-weather protection
  • Direct-zip-access hydration sleeve with HydraLock frame keeps your H2O comfortably in place
  • Zip-access sunglasses pocket with protective fabric for your shades or glasses
  • Stretch mesh front pocket stashes your extra gear
  • Roomy zippered hip-belt pockets provide quick, secure storage
  • Stow-on-the-Go feature quickly secures your trekking poles while a helmet attachment loop secures your bike helmet
  • Dual-side compression straps keep your pack's load solid and stable

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Here's what others have to say...


Perfect size for any outing

  • Familiarity:I've used it several times

Get pack that I can use for anything and everything. Not too small, not too big. I can use it for a short bike ride, or I can use it for an overnight trip. No complaints with the hydration portion of the pack.

Ryan, I use the women's version the Mira 26, and that mid 20 liter size is fantastic. Yes, not too big, not too small! Great zippered pockets, compartmentilization, and a rain cover! Go Osprey!

Osprey Rep


Nice pack!

  • Gender:Male
  • Familiarity:I've used it several times

Needed a smaller pack with hydration for a day long adventure up and over Mt. Washington. I'm 5'10" and I bought the M/L. Fits great. The light weight frame directs the load to your hips and the mesh panel keeps the air flowing between your back and the pack. There are plenty of zippered compartments to organize all the items you like to bring along with you. The 3L bladder with the semi rigid panel slips in and out of the pack easily. The bite valve is ok, the flow could be better. The magnet on the valve is a great feature. It keeps the hose from flopping around. All in all I highly recommend the Manta 28. The 28 maybe too big for MTBing but perhaps the 20 is ok. I actually went with the Raptor14 for MTBing.

Hey Jeff, thank you for the solid review on the Manta 28. I have the women's version - the Mira 26, and agree 100%. I also agree that the mid 20s for a liter volume can be a bit much for Mtn Biking, but, also like you, I go with the women's version of the Raptor, called the Raven. Absolutely perfect!

Thanks for taking the time to write!
Osprey Rep


Perfect day pack

  • Familiarity:I've used it several times

I use the Manta 28 for day hikes all the time. i can fit a light weight jacket, my first aid kit, sun screen/bug spray, my nikon camera, snacks, and my beloved nalgene. You can't go wrong with this pack you can fit everything you need for a nice summer hike!

Perfect day pack

What size reservoir does this come with?

Unanswered Question

Can you replace the hydration sleeve with a laptop?


Great Pack

  • Familiarity:I've used it several times

This pack holds plenty of water and accessories - at least for the adventures I go on. The features of this pack are awesome - they thought of everything! Everything is right where you can get at it. No digging through all your stuff to access what you need.