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Osprey Packs Manta AG 28L Backpack


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    • Fossil Grey, M/L
    • Fossil Grey, S/M
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    • Spruce Green, M/L
    • Spruce Green, S/M

    12 Reviews


    A do-it-all pack for the singletrack bound.

    Get your mountain bike or hiking gear together with the Osprey Manta AG 28 Hydration Pack. Designed for daylong adventures, the Mantra AG 28 incorporates tons of thoughtful details to keep you on the move. A lightweight, supportive, and breathable Anti-Gravity suspension system helps to distribute the weight of the pack evenly along your hips, shoulders, and lower back, while the convenient panel-loading design grants easy access to the cavernous main compartment with a quick zip. Osprey built the Manta AG from durable nylon fabrics to withstand heavy wear, and the included hydration reservoir makes it easy to stay hydrated whether you're mountain biking, hiking, or just hoofing it across campus.

    • Anti-Gravity suspension system
    • Lightwire frame
    • Biostretch harness
    • Front panel access
    • High tenacity nylon fabrics
    • Integrated rain cover
    • Hydration sleeve (reservoir included)
    • Helmet attachment loops
    • Side compression straps
    • Trekking pole loops
    • Item #OSP004X

    Tech Specs

    [main, bottom] 210D nylon, [accent] 100D nylon ripstop
    [small/medium] 26L (1587cu in), [medium/large] 28L (1709cu in)
    Waist Belt
    Hydration Compatible
    Reservoir Included
    yes, 2.5L
    front panel
    [external] 1 zippered slash, 1 mesh front, 2 mesh side, 2 zippered hipbelt, 1 zippered front, [internal] 2 mesh
    Helmet Carry
    Trekking Pole Carry
    Rain Cover
    Weight Capacity
    10 - 30lb
    22 x 13 x 12in
    Claimed Weight
    [small/medium] 2lb 10oz, [medium/large] 2lb 11oz
    Recommended Use
    hiking & camping
    Manufacturer Warranty

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Great gift!

    • Familiarity: I gave it as a gift but have feedback to share

    We bought this as a gift to our brother who has been doing a lot of hiking lately. We loved the space it has, plus back support, and hydration pack. When our brother got it, he was super excited.
    We have also heard that osprey will replace any damaged parts which helps us know the quality is there.

    Get the 36L instead!!!

    • Familiarity: I've used it several times

    It's a great pack; however, I highly recommend getting the 36L instead of the 28L. It's only 3 more ounces and you will appreciate the extra space.

    I've used this pack on a dozen day hikes so far, both short and long (22mi). It works for long hikes in the summer, and short hikes in the winter. However, with winter clothes/gear (spikes, gators, etc) it fills up very quickly.

    I thought 28L would be enough, but the space is vertically distributed and the pockets don't have a lot of horizontal-depth. This makes it feel like I have to cram stuff into pockets even when there 'should' be enough space. Furthermore, there are straps/buckles on the sides that you can use to attach things, but nothing on the front, which I think is a missed opportunity (looks like 36L would be easier to buckle a jacket on the outside of).

    Awesome Pack!

    • Familiarity: I gave it as a gift but have feedback to share

    Gave this as a gift because my dad is hiking Mt. Kilimanjaro. I loved the Fossil Blue color!

    It's a great pack that fits everything you need without being too bulky! The hydration pack is a mega plus!


    • Familiarity: I've put it through the wringer

    I’ve been using this pack as an overnight weekend pack and I’m pleased with the performance. The 28L size is perfect for ultralight backpacking but does have a few drawbacks. First of all, the hydration reservoir is a big upgrade from my camelback. The reservoir is easy to fill, clean, and drink from without any leaking. I did buy a cap for the mouth piece as it can be difficult to lock. The pack itself is comfortable. I’m able to stuff my down bag, rain shell, sleeping air pad, and Slater UL2 tent in the main compartment. I like how the main compartment doesn’t expand that far into the front zipper pocket as it’s able to expand further out for more items. The side water bottle pockets can also fit Nalgenes size bottles with the main compartment stuffed, but is better with 1L Platypus bottles as they are flatter and lighter. There are many small pockets inside the compartments for smaller items. I don’t like how the dedicated reservoir pocket has a lot of dead space when placing the full water reservoir inside. I would’ve also liked seeing some sleeping pad straps on the outside of the pack for foam pads. Overall I’m pretty pleased with the pack, despite using it beyond its intended use. The more weight you carry, the more uncomfortable the pack gets. Keep it under 25-30lbs and you’ll be good. I feel the price is a bit high for this pack, but the water reservoir is worth every penny.

    Everything you need in a day pack

    • Familiarity: I've used it several times

    I purchased two Osprey Manta AGs (one 28L and one 20L) to share across my family. We are planning on hiking the Grand Canyon north rim to south rim in one day (24 miles) and looking for day packs to handle all the necessary items for such a hike. The Manta AG line has it all! These packs are beautifully made, durable, and so comfortable with the anti-gravity suspension.

    Items I like are:
    trekking pole attachments
    lightweight frame with compression straps
    waist belt is very comfortable
    stretch mesh water bottle side pockets
    zippered pockets on the  waist belt
    high quality materials
    and, my favorite, the magnet on the hydration mouth piece!

    Keep up the good work Osprey!
    A happy satisfied customer.

    Great day hike pack

    • Familiarity: I've used it several times

    Very happy with this pack for day hiking so I bought one for my wife who also likes hers. AG system takes weight off your shoulders and the pack has good pockets and layout. Only issue is the pack squeaks at times while hiking, hoping this fades as it gets more use.

    Day Pack

    • Familiarity: I've used it several times

    This is a great day pack for the person who likes to bring a little more than is probably necessary and not have to worry about smashing stuff in and tight zippers. Sure you could hike a 14er with a smaller pack but if being prepared gives you peice of mind, this is the pack for you. I use it to hold 2.5 liters of water, extra layers, shell, lunch, snacks, gloves, hat, steripen, phone charging battery, headlamp and sunblock. Plenty of room. Trekking pole holder is nice. I like the clean flat back that Osprey uses. Originally bought the Camelback fourteener but this was much more comfortable on the back. The side straps are nice and sturdy. Strap pockets hold headlamps, bug spray, extra batteries, etc. I am really liking this pack.

    Manta AG

    • Familiarity: I've used it several times

    Before I launch into this review (and this is my first review ever) let me say that I am a fan of Osprey and own 6 of their packs in different sizes and for various purposes.
    My wife and I use our day packs on a continual basis in our role as interpretive rangers at a state natural area here in Texas. The AG design is not only comfortable but also works great in the heat. The layout of the pack is well thought out and the new hydration bladder ( no more cross threading) and reservoir sleeve design is a real plus. The shut-off on the bite valve is not as simple as the old design.
    Now for the negative. The H2O hole is in the center of the pack. Gone is the selection of left or right holes to route the tube from the bladder. Consequently, the tube exits the pack right at the base of your neck and must make a right angle bend to thread down the shoulder strap. Because of the bends in the tube coming off the side of the bladder and then making the right angle turn, the connection at the quick release tends to come undone...not to mention having the tube riding on your neck. I have fiddled with the system and seem to have it under control. I can only assume that the rational for the one centrally located H2O hole is cost. I think in this instance Osprey has messed with what was a previously successful equation and they should rethink this feature. Still, the AG design makes it an extremely comfortable pack that I can (and do ) wear all day.
    Probably more of a 4.5 star rating.
    Still a fan of this fine product.
    Russell Vowell

    This is the One

    • Familiarity: I've put it through the wringer

    My wife used this pack for nine consecutive days of day-hiking on the Tour du Mont Blanc in France, Switzerland, and Italy. To avoid the cost and complication of having porters bring our luggage around from town to town, my wife packed all of her belongings for nine days into the Manta AG 28. Mind you, this was two pairs of pants, base layers, shorts, several pairs of underwear (for hand washing), sandals, rain gear, gaiters, toiletries, sleeping bag liner, water, and kindle. There was even space to stuff in a packed lunch. With those items, this pack was completely maxed out for space, but my wife did comment that this pack does not lose any comfort with added weight, due to the Anti-Gravity suspension system.

    This pack was great on warm days, and when it snowed on us on July 14 in the Alps, the rain cover that is included with this pack kept it dry, and also served as a waterproof butt-protector for impromptu sledding! I can't say enough good things about this pack.

    This is the One

    Great design, but needs a L/XL size.

      The M/L sizing really doesn't work for me as I'm just beyond it's extreme range of torso length at 22". I tried to get fitted in the store and it just won't sit right. I'm 6' 1" 205Lbs and although the hip sizing has lots to spare, this model pack could really use the addition of a L/XL size to account for long torsos. Other than that it seems like a fantastic pack for day hikes with that extra bit of gear. I love all of the features and the burly construction, not flimsy material like the U/L Osprey packs. I'm giving it 4 stars from what I can tell from reviewing it in the store. Dropped a star since it won't fit.

      Fantastic Day Hiker

      • Familiarity: I've used it several times

      This is my first Osprey bag, and I absolutely love it. By far the most comfortable pack I have used. The feature that keeps the surface of the backpack out of direct contact with your back really makes long treks on hot days quite comfortable. With the new 2016 model, the hip belt actually grips your hips, making for even better weight distribution and less fatigue. Phenomenally functional and supremely stylish, this pack is a no-brainer for any outdoor enthusiast.