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  • Arc'teryx - Altra 65 Backpack  - 3965-4148cu in - Diablo Red
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  • Arc'teryx - Altra 65 Backpack  - 3965-4148cu in - Diablo Red

Arc'teryx Altra 65 Backpack - 3965-4148cu in

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    • Reg/Tall

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    • Diablo Red

    14 Reviews


    For multi-day trips or light-packing weeklong hauls into the backcountry.

    Save energy and keep your trek into the backcountry light with the Arc'teryx Men's Altra 65 Backpack. Ideal for multi-day or weeklong backpacking adventures, the Altra expands and compresses to the size you need while also providing the comfort, support, and stability you require when you're slogging up a scree-covered rock field or a steep trail to high-mountain lakes.

    • C² (composite construction) system's minimized construction lamination decreases pack weight and makes the pack sit close to the body, which minimizes load movement and backward pull and increases energy conservation
    • Load Transfer Disc naturally moves with your body while distributing the pack's load weight to your hips for improved comfort
    • GridLock shoulder straps adjust for both height and width
    • Ergonomically shaped shoulder straps feature 500D nylon with silicone-treated PU fabric for durability and protection, a Hypercell foam for stability and comfort, and SpacerMesh lining for airflow
    • Twin 6005 T-6 extruded aluminum M-bar stays are rigid and lightweight to provide structural support
    • Back panel consists of HD 80 foam for support and structure, burly double-weave fabric offers strength and durability, and the back panel sits away from your back to boost ventilation
    • Altra 65L is available in regular and tall and works as a fast-and-light pack for multi-day trips in the backcountry
    • U-shaped zipper offers easy access to your gear
    • Extendable top lid and extension collar enable you to carry larger loads
    • Body fabric consists of 210D nylon ripstop fabric coated with silicone to shed moisture and provide durability and tear-resistance
    • 500D nylon silicone-treated PU fabric in high-wear areas supplies extreme durability and resists dirt, snow, and water pick-up
    • Extension collar features 100D nylon mini ripstop fabric that has incredible tear resistance and a silicone coating that sheds moisture
    • Hydration compatible (bladder not included) with a hydration sleeve external access point for convenience
    • Wingman pockets make it easy to grab your camera or headlamp one-handed
    • Double-chamber top lid organizes your gear
    • Large front kangaroo pocket stashes frequently used items
    • Item #ARC3537

    Tech Specs

    Manufacturer Warranty
    Recommended Use
    Claimed Weight
    [regular] 4 lb 15 oz, [tall] 5 lb 1 oz
    Detachable Daypack
    Rain Cover
    [external] 1 large front, 2 waist-belt, [internal] 1 security
    Reservoir Included
    Hydration Compatible
    Shoulder Straps
    GridLock system
    Twin 6005 T-6 extruded aluminium M-bar stays
    [regular] 3965 - 4453 cu in, [tall] 4148 - 4575 cu in
    [body] 210D nylon 6,6 ripstop silicone treated, 500D ATY nylon 6,6 silicone treated PU, [collar] 100D nylon 6,6 mini ripstop with silicone coating, [back panel] HD 80 polyethylene foam, [shoulder straps] 500D ATY nylon 6,6 silicone treated PU, Hypercell foam, [shoulder strap lining] Spacermesh

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    It takes all the abuse.

    • Familiarity: I've put it through the wringer

    This pack is tough! It has been tossed and schlepped on many a flight. It gets slidden down slot canyons. Nothing has been able to tear or wear this pack.
    The huge zipper allows me to access the entire main compartment at once instead of simply digging through from top to bottom.
    Each side pocket holds a 1.5L Nalgene easily.
    The play on the hip belt makes climbing and twisting through narrow spaces easier.
    I have been tempted by other packs, but this thing holds up so well that I cant justify buying another. It'll be a long while until this one needs to be replaced.

    So, so many pockets

    • Familiarity: I've used it once or twice and have initial impressions

    I have only used this pack a few times. But it has surpassed all of my expectations. It fits my body perfectly, and has pockets everywhere I would want them to be. It makes storage a breeze, and feels good on my back.

    Great backpack at an expensive price

    • Familiarity: I've used it once or twice and have initial impressions

    The pack is great.

    Tons of adjustments that make the pack fitting you perfectly, while you wont find them cumbersome when not in use.

    Pocket designs are good as well, love the kangaroo pocket that allow quick access of things like gloves and coat; wingman pocket for easy access of water bottle; and the main compartment could be fully opened for easy access.

    The pivot hip belt does help, but also does make some sound, but the sound become minimal in a trip or two, and that's not a problem to me. I also love that the belt could be removed and be be placed around the pack, this makes sending the pack as a baggage in the airport a lot easier!

    All in all, it's a great pack that is comfortable to carry and easy to access. But it is also way more expensive than it's competitor. If you want a great pack and don't care much about the price, this is the one to get. But if you are looking for something of great value, I'm sure you could find another pack with most similar features but at a much lower price.

    Great pack, check sizing options.

    • Familiarity: I returned this product before using it

    This pack is simply amazing. It has many adjustable features allowing you to tailor the fit perfectly. However, do be aware of the hip belt sizing options. I ordered the short/regular pack and received a small sized hip belt. is unable to exchange the belt and will require you to deal with artery'x directly.

    Best pack ever!!??

    • Familiarity: I've used it several times

    I'm 5'6 150 and ordered a small reg. The fit was spot on. The rotating hip belt is what makes this pack great and the padding wasn't overly hard but very comfortable. I walk with my hips. When you walk with this pack the hip belt moves with your hips and the pack stays put to your back. No swaying back and forth. I didn't feel like I was going to tip over while doing some light scrambling or when going up steep inclines. Several reviews people have complained about squeaking from the shoulder harness to the hip belt. I added a decent amount of synthetic grease and no more squeaking. Even when there was a slight noise coming from the pack it still doesn't change how comfortable the pack is. There is tons of space and the wing pockets make it easy to fit my Nalgene bottle as well as other decent size items. My platypus big zip 3L fit in the main water compartment. The Altra 65 price is really steep compared to other brands but I love Arcteryx and def recommend this pack. Don't let the price fool you, it's worth it????

    Is it at least water resistant? I read the description and am not entirely sure what "water pickup" means. If not, would it be a bad idea to add a water proofer? Spray or wash?

    Where is the Altra 65 Backpack manufactured?

    when will the red model be available in a reg/tall?

    What kind of grease are you supposed to use for the load transfer disc? Mine didn't come with any grease.

    Best Answer

    Here's what Arc' says:


    Special AC2 lubricant may be obtained from most Arc'teryx retailers. If AC2 lubricant is not available, contact our Warranty Department

    Alternately, you can use plumber's silicone grease as a back-up, available at most hardware stores or scuba dive shops.

    Do not use oil based lubricants such as WD40, as it will cause the Discs to seize and degrade the urethane components."

    ... and I hope that helps!

    I would just call them and they will send you a little tube of lube!

    If my back length is 19.5", would it be better to go with the short/reg or the reg/tall? The size chart has the short going up to 20" and the Tall starting at 19". Is it just a coin flip, or would there be a benefit to being on one end or the other end of the scale?

    Best Answer


    The deciding factor for me would be the desired pack capacity, because you could go with either since you're right on the cusp- the Regular is 3965 - 4453 cu in, while the Tall is 4148 - 4575 cu in-- do you want/need the extra 183 cubic inches?

    Feel free to give me a call if you need anything else- I can be reached at 1-800-409-4502 ext 4456, or

    Can someone give me the approximate dimension...

    Can someone give me the approximate dimension of the pack moderately full? Just curious how much larger it is, since I've never used anything bigger than a 45L. Thanks

    Here you go. These are approximate but give you an idea. Had this pack to normal capacity (65 liters) ... with the kangaroo pocket packed with rain gear. The pack was not completely turgid, but full.

    When viewing the back with the hip belt facing away from me:

    33 inches high

    14 inches wide across the main body

    19 inches wide across the wingmen

    14 inches deep

    I hope that helps.

    My guess is this thing will stretch up to 1.5 inches in each of those dimensions... except height, where it could rise like another 6-8 inches if needed.

    This pack is GREAT. Hope you buy and enjoy it. It's crazy expensive, but it's cheaper than a Ferrari or an extra-marital affair!

    Happy to help. You got lucky: I was doing a gear demo to some new boy scouts today.

    I find it's a very versatile pack. I use mine for 2 mile "expeditions" with 10 year olds, then turn around and use it for 15 mile-per-day through hikes with my friends on the AT.

    Love this pack. It WILL squeak on you, so do carry the grease if that sort of thing drives you nuts... but that's it's only fault. Other than that I honestly can't imagine anything better and I've used a lot of packs in my life.

    What's the the difference between the tall...

    What's the the difference between the tall and short?

    with the arcteryx altra 65, since it's not...

    with the arcteryx altra 65, since it's not waterproof an i'm new to camping is their a means to waterproof the pack?


    While the Arc'teryx Altra 65 Backpack is not waterproof it will be very water resistant and should shield the contents of you bag from moisture in most circumstances. However, when the precipitation is really coming down you will want a pack rain cover. Most packs don't come with them but Gregory makes a good durable model:

    Best Answer

    It's often more effective to waterproof what's inside the pack by means of ziploc bags, etc.

    Stil.... Arc'teryx makes a pack cover specifically for this pack. It's a little heavy and it's a little expensive, but it fits perfectly and will keep everything dry.

    Can you attach ice axes to the pack? I...

    Can you attach ice axes to the pack? I see in the video they use the smaller version of this pack with ice axes, is it possible?

    Best Answer


    Yes, the big expedition sized Altra packs all use basically that same P'ax system that you saw in the videos. For carrying, you would use both loops at the ends of side compression straps, but for one-hand, what you do is slide the axe or ice tool shaft under just the upper loop, lift a little, then slide the axe head into the sleeve you see the lower comp strap going into at the bottom of the pack. I know it might sound confusing, but it does work. Watch the videos again and scrutinize the Altra's features, you'll see pretty much how it works.

    How many liters or cubic inches is the...

    How many liters or cubic inches is the main compartment? (not the Kangaroo pouch)

    Best Answer

    Arc'teryx equipment team: "The capacity of the entire pack is 65L when the lid is closed at its optimal height. This closure can expand to overstuff the pack and the capacity goes up to 75L's total. This however may leave some spots on the pack susceptible to water leaking in and hitting fabric that is not as water resistant.

    The Kangaroo Pouch has a capacity of approximately 12L So the (main compartment) Pack will be 53L with an expansion to 63L total."