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  • 3mm Lightwire peripheral frame tensions the mesh against your back and transfers the load from the harness to the hipbelt
  • 3D tensioned mesh comfortably wraps and conforms to your body while providing excellent ventilation
  • Mesh-covered, die-cut foam provides ventilation and an active, contoured fit
  • Convenient panel access to the main compartment and internal mesh pocket
  • Heat-embossed, scratch-free zippered slash pocket; dual-access side stretch-mesh pockets; zippered hipbelt pockets
  • Helmet attachment loop doubles as a blinker light attachment
  • Zippered, direct-access hydration compartment contains a 2.5-liter (85 fl. oz.) Hydraulics™ LT reservoir
  • Dual upper and lower compression straps
  • Stow-on-the-Go trekking pole attachment
  • Integrated raincover
  • Magnetic bite-valve attachment on the sternum strap


View all Osprey Daypacks

REI membership


Best Use Hiking
Frame Type Internal Frame
BPA Free Yes
Gear Capacity (L)
28 liters
26 liters
Gear Capacity (cu. in.)
1,709 cubic inches
1,587 cubic inches
Reservoir Capacity (fl. oz) 85
2 lbs. 11 oz.
2 lbs. 9.6 oz.
Adjustable Torso Yes
Fits Torso
18 - 21 inches
16 - 19 inches
Fits Waist/Hips
31 - 55 inches
29 - 53 inches
Material(s) 210-denier nylon
Frame Material Steel alloy
Pack Access Front/top/side/back
Number of Exterior Pockets 3+ main compartment
Hipbelt Yes
Bite Valve Shut-Off Switch Yes
Quick Disconnect Tubing Yes
Wide-Mouth Opening Yes
Suspended Mesh Back Panel Yes
22 x 13 x 12 inches
20 x 13 x 12 inches
Gender Unisex
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 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 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 Back feels great! Compared to the amazon backpack I got (which was highly rated) this thing is much better. 8hrs feels like nothing with the AG suspension system. I will Update again if I have any issues with further hikes.
Date published: 2016-08-26
Rated 4 out of 5 by from Good.... but one kind of annoying feature. I use this for travel, commute and hiking. To be honest, its a great pack... but i do have one complaint: the hip belt. The hip belt is pretty rigid, and i dont need it all the time. Im a larger guy (6'2", 240lbs). The hip belt naturally is designed for a more... compact person.... than me. Its good enough for hikes, but during commuting i dont need a hip belt. The foam makes it incredibly thick and, most importantly, impossible to get out of the way when they aren't needed if i could remove the foam or get the hip packs out of the way this pack would go from a 4 start to a 5 star
Date published: 2016-11-01
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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The clip on the chest strap of my pack broke, is there a replacement I can order?

Asked by: jayneg
Osprey has an amazing warranty. check with them
Answered by: p8ton
Date published: 2017-04-15

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'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

Are the manta packs being discontinued? I notice the Stratos has been updated and the Manta is no longer available on the European osprey site. 

Asked by: Greenj
As of December 2016, we will continue to receive the Mantra and Stratos packs into at least early 2017.
Answered by: REIservice
Date published: 2016-12-26

I am 5 feet tall and my husband is 5'10". We want to get a pack both of us can wear. Would the pack work well for both of us being not too big on my back? Thanks

Asked by: KendraAnders
The most important measurements to take into consideration when sizing a backpack are the torso length and waist size. These measurements are in the specs tab on most backpacks we sell. The link below is a great article on how to find your torso and hip size for a backpack.
Answered by: REIservice
Date published: 2017-01-11
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