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Rated 5 out of 5 by from Awesome. I needed something bigger than my older Camelbak hydration pack that could only fit some keys and a wallet for some day hikes since moving to Sothern California. It felt like I had nothing on my back. Most of the weight ends up on your hips and it's amazing how little you think about what's on your back or the weight. I love Osprey and especially their AG system. I have the Atmos 50 AG and it's why I bought this day pack. It's the perfect size for mountain biking and day hiking, which I do both of. Highly recommended.
Date published: 2016-04-25
Rated 5 out of 5 by from Best Pack I've Owned I bought this pack to take up Mount Elbert last week. Throughout the entire 7 hour climb and descent, not once did my back or shoulders ache with a full load. The AG system is well worth the cost over the regular Manta pack IMO, it hugs your waist better than any other pack I've used. Overall: outstanding build quality, versatility and comfort and hits the sweet spot for capacity for a single day (or even two) hike.
Date published: 2016-06-28
Rated 5 out of 5 by from As close to perfect... This pack is the perfect size for extended day hikes or ultralight overnight excursions. Fit is superb - easily the best fitting pack I have ever owned, and it's not even close. The features are above and beyond, but not so many that it becomes cumbersome. Access to internal compartments is excellent, stow-on-the-go trekking pole attachment convenient as always and the zippered pockets on hip belt make keeping the camera, snacks or compass easily accessible. I love that it has an attached rain cover with it's own dedicated pocket...most packs in the size and price range don't include a rain cover. I just wish the pack came with the 3L bladder as opposed to the 2.5L one. Not a big deal, but I like the added volume of the slightly larger bladder. These newer bladders do seem easier to clean and the quick-connect and angled bite valve is a big improvement over previous versions.
Date published: 2016-08-09
Rated 2 out of 5 by from Love it, hate it, returned it. I love this pack for the way it fits. I have a 32 waste and very narrow hips. All other packs keep sliding down. This pack stays above my hips and because of the internal frame takes the weight off my shoulders. I also love the way the water reservoir easily goes into the pack without much effort. I hate the noise this pack makes. It squeaks, creaks, rattles, etc. I tried lots of things to stop the noises, even wrote to Osprey. It just got worse with time. This is a great pack if you are hiking next to a bubbling stream, near a busy highway, in a strong whistling wind, or with a very talkative friend. Most of the time no-one wanted to hike behind me. I ended up returning the pack. Thank you REI for your great return policy.
Date published: 2017-08-06
Rated 5 out of 5 by from My Second I'm awaiting my second Mantra. I purchased my first 2 years ago and it has been through the ringer. I run commute from 5-10 miles per day, rain or shine, hot or cold. I've climbed mountains or just long trails on day hikes. This pack has carried quite a bit in its day. I'm retiring the original as the fabric is starting to show wear from this extreme abuse, but my order is in for my next one. I'll still use this original, just not as roughly as in the past, there are many years left in the pack. Love the design, weight, fit and comfort. You rarely even notice you have the pack on.
Date published: 2016-10-20
Rated 3 out of 5 by from Loved it until it started squeaking I loved this pack other than it was a bit snug around the chest so I can't really use the magnet clip I would like to see a pit more adjustment in that or make a larger size pack. Lot's of pockets with a place for everything. I had one issue when the hydration bag broke but I sent it in and it was replaced with a sturdier model. My biggest drawback to this bag is it squeaks very loudly. I've tried adjusting the load every way I can think of and empty or full it still squeaks enough to drive a person crazy. When enjoying the great outdoors I want to be able to hear nature and maybe an animal but not with this pack.
Date published: 2017-12-08
Rated 5 out of 5 by from Day Hikes Plus Travel - Exceptional Comfort I am 6'2" 175 lb and was worried this pack would not fit my long torso, however, the shoulder and load lifter straps adjust enough to fit me very well. The AG suspension system is awesome, I've loaded this guy up with 30 lbs of stuff and it's more comfortable than my larger 70L backpacking pack at the same weight. I chose this model over some of Osprey's other day hike / multi-purpose medium hydration packs for the trekking pole loops, and they work great. The included rain cover has been used once in a heavy downpour and kept the pack completely dry. Only very minor complaint is that the hip belts stay wrapped around pretty far even after removing the pack, which makes swinging the pack off to retrieve something from the mesh pocket (like a map) a bit unwieldy when swinging back around to keep moving quickly. Problem solved by bringing a friend on your hike so you don't have to remove your pack. Bladder design is excellent and the 2.5L capacity gives plenty of water, even for long and hot summer dayhikes here in Georgia. Side pockets are a little snug, but better than your nalgene or other items falling out. Pack those in first, before the main compartment. It also fits reasonably under the seat of an airplane for travel use as the personal item. Very happy with this pack so far, final test will be a single overnight trip to see if all my gear fits in this one or if I should have gone with the 36.
Date published: 2016-06-29
Rated 5 out of 5 by from Great Pack but didnt like the bite valve. Bought this pack for my Mount Whitney summit. I shopped various other Osprey packs and other brands and this was the most comfortable, had the best strap system and the best storage. Wore it on 3 training hikes and for Whitney. The pack sat with perfect balance on my shoulders and hips. The side hip pockets were great for GU and other snacks. I was able to get one bladder in the designated pocket and another in the main compartment and still had room for extra clothes and food. My only complaint is the bladder that came with it. Not only is 2.5L a little too small for a long hike, but the bite valve is restrictive. I swapped it out and used 2 Camelback bladders I already had. Only problem now is that I need to find more long hikes so I can use this cool pack.
Date published: 2016-08-30
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Questions & Answers

The clip on the chest strap of my pack broke, is there a replacement I can order?

Asked by: jayneg
​We unfortunately do not have a replacement chest strap available for sale; we recommend getting in contact with the vendor Osprey for a replacement strap.
Answered by: REIservice
Date published: 2017-02-24

Does the weight include the hydration bladder?

Asked by: sierraHiker3
No, the weight listed is for the Manta AG 28 itself,​ not including the hydration reservoir.
Answered by: REIservice
Date published: 2016-09-01

I am trying to decide between the Osprey Manta AG28 and the Osprey Mira AG26. What would be an advantage of one over the other or in other words what are their differences? 

Asked by: doglover
​The only difference between the Mira AG 26 and the Manta AG 28 is the fit. The Mira series is a women's specific fit. The hipbelt and shoulder straps on the Mira series are contoured to better fit the female form. The Manta also has 2 more liters of gear capacity.
Answered by: REIservice
Date published: 2018-02-13

I am trying to decide between Stratos 24 and Manta 28 packs. Other than the size difference and the inclusion of a bladder in one, I am having a hard time figuring out the differences between the two.

Asked by: Owen
​The Manta AG uses Osprey's Anti-Gravity technology. This allows you to fine tune the fit of the shoulder straps. The Manta AG also has 4 more liters of gear capacity and a slightly more robust hipbelt. Both pack comes with a raincover.
Answered by: REIservice
Date published: 2017-08-31

I'd really like to get Manta AG's for myself and my girlfriend for day hikes. She wants the blue that the AG 28 comes in, but I believe the AG 26 is for women. Would she end up feeling uncomfortable if she got the AG 28 instead of AG 26 for women?

Asked by: nomadicty
We recommend comparing her torso length and wait/hip size to the dimensions of the pack. If they fit her, she can most likely wear the pack comfortably.
Answered by: REIservice
Date published: 2017-06-13

I use the atmos 65 AG for backpacking (wish it was bigger, 80 liters) I would like to get a smaller day pack to take with for day hikes while backpacking. Would this day pack store easily in the Atmos 65, to take out and use on day hikes?

Asked by: Speedyodie
The Manta AG 28 Hydration Pack will not be the best choice for the Atmos 65. The Manta cannot be rolled or folded because of the very rigid frame. The Osprey Daylite Plus Daypack would be a better choice.
Answered by: REIservice
Date published: 2017-01-27

can this pack be used for ultra/trail running???and if no what do you recommend???? thanks :]

Asked by: vesuvius
The Manta AG 28 Hydration Pack can be used for trail running. Some ultra runners might use a smaller volume pack depending on how much extra gear is needed to carry.
Answered by: REIservice
Date published: 2016-08-26

The Manta AG 28 comes with a 2.5 L hydration pack and I was looking for a pack with a 3 L pack. Does the Manta 28 fit a 3 L hydration pack or am I stuck with the 2.5?

Asked by: nnrda
The larger 3L reservoir will fit in the Manta AG 28 pack.
Answered by: REIservice
Date published: 2017-05-14
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