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Aer Sling Bag 3 Review

The Aer Sling Bag 3 is a mini backpack in disguise. It’s big enough for a laptop and gym clothes, but we’ve got a bone to pick with the carry strap.

Our Verdict

7.2 /10
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  • Big enough to fit a 13” laptop
  • Device sleeve keeps tech accessories organized
  • Aquaguard zipper on front pocket provides extra weather resistance


  • Carry strap can cut into your neck and chest while wearing
  • Internal organization gets tight when you’re using the shoe compartment
  • Bag’s bottom tends to stick out away from the body
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Technical Details

92 %

Carry-on Compliance

View 134/145 Airlines

48 %

Like the Look

Polled on Instagram

  • Capacity


  • Weight (lb)

    1.3 lb (0.6 kg)

  • Denier


  • Dimensions

    16.75 in x 10 in x 6 in (42.5 x 25.4 x 15.2 cm)

  • Notable Materials

    CORDURA® Ballistic Nylon, YKK Zippers, Duraflex Hardware

  • Manufacturing Country


  • Laptop Compartment Size


  • Warranty Information

    Aer Lifetime Warranty

Full Review

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Slings can be such a polarizing piece of gear. Love them or hate them; there’s no denying their convenience when going through TSA or carrying your essentials day-to-day. But what about when you have more to carry and don’t want to wear both a backpack and a sling? What if there was one product that could somehow function as both? What if we told you the Aer Sling Bag 3 may be precisely what you’re looking for?

Aer Sling Bag 3 Review
Aer Sling Bag 3 | Ready to roll.

The Aer Sling Bag 3 was designed for the busy person on the go who’s knocking out their morning cardio before work. It’s part of Aer’s Active Collection 3.0, which includes a whole host of duffel bags and daypacks for those of us trying to balance the fit life and work life. The Sling Bag 3 is spacious enough for a laptop, has a compartment for shoes, and excellent internal organization for tech gear. We used it for two weeks while biking between the office and yoga and had high hopes for it as a contender to bridge the sling, backpack divide.

Aer Active Collection 3.0
The Aer Active Collection 3.0—Aer Sling Bag 3, Aer Duffel Pack 3, and Aer Fit Pack 3.

Unfortunately, we just couldn’t find a way to get comfortable with the carry strap. We found that it can cut into your chest at an awkward angle, and the bottom of the bag tends to stick out away from your body. Several members of our team who vary in height tried it out with similar results. And we know a thing or two—we literally wrote the guide on slings. We’ll get into the nitty-gritty of that later. First, let’s check out the materials.

Materials & Aesthetic

Like most of the products in their Active Collection, the Aer Sling Bag 3 is made of a sturdy 1680D Cordura Ballistic Nylon. It’s rough and tough and ready for some heavy stuff. By heavy stuff, we mean dusty gym floors and light rain—the thick material is reasonably resistant to both scuffs and water. Apparently, Cordura was initially developed for military body armor. Sounds extreme, but we guess there’s a reason it’s called “ballistic” nylon. Regular old nylon just won’t do.

YKK zippers are used throughout the bag. The front pocket has a chunky reverse coil YKK #10, while the main compartment has a slightly smaller #8. These are the bad boys of zippers, and we haven’t had one break on us to date. Aer’s zipper pulls tend to be long and jingly. They are still long and a bit jingly on this sling, but they aren’t as loud as some previous Aer bags. That front pocket zip also has YKK Aquaguard for some extra water protection for your tech accessories or essentials.

Aer Sling Bag 3 material
Aer Sling Bag 3 | Cordura fabric, YKK zippers, and Duraflex hardware. Signs of quality!

With the combination of YKK zippers and Duraflex hardware on the strap buckles, we can confidently say that this sling is made with premium materials all around. Quality hardware, robust fabric, and expert construction make it highly durable. So if you do choose to buy it, it’ll basically be with you forever.

All of those serious materials may sound a bit rugged, but Aer puts them together with a minimalist aesthetic that looks clean and modern. It’s versatile too, so even if you’re not as hip as the models on the Aer website, you can still rock this sling with ease. We went with all black, but there’s also a grey version made with an eco-dyed polyester instead of Cordura. We have used other Aer products in that colorway, but this review will focus on the Aer Sling Bag 3 in black. The black version is pared down and easy on the eyes, but there are actually quite a few notable features once you get into it.

External Components

Aer Sling Bag 3 male/female fit
Left: Mark Hurrish, Height, 5’10” (178 cm), Torso: 19” (48 cm) | Right: Randiah Green, Height, 5’4” (162 cm), Torso: 19” (48 cm)

At the bottom of the Aer Sling Bag 3 is a shoe compartment if you have a special pair for running or weight lifting to bring along. So far, we haven’t had a sling with a dedicated place for shoes, and it was pretty exciting to carry our gym gear without the need for another bag. There’s a little strip of Hypalon with three holes punched in it for ventilation to let out funky smells. We didn’t notice whether it made that much of a difference. But we also didn’t notice any odors, so maybe it was working after all.

As it typically goes with shoe compartments, the caveat is that it will take up space from the other compartments when in use. It’s supposed to fit up to a men’s size 12, but with the women’s size 8.5 we used, the internal pockets were already feeling cramped. On the inside, there are several small pockets where you can put snacks, cables, or anything you’d like. When you have shoes packed in here, though, those pockets can be hard to access. The shoes are almost in the way, and the front pocket is affected similarly.

Aer Sling Bag 3 main compartment
Aer Sling Bag 3 | Main compartment with shoes (left) vs without shoes in the shoe compartment (right).

When you’re not using it, you can also roll the shoe compartment up and stow it in a little flap, so it’s out of the way. This will free up space inside the bag, so the lining isn’t just floating around when not in use—a clever and considerate design feature.

Now to address that shoulder carry strap we mentioned earlier. It’s well-padded, has breathable mesh, and looks like it would be comfortable. Our issue, however, is with the fit rather than the materials used. No matter how much we adjusted it, the sling just did not sit right. If we left the strap a bit loose, it hung down too low. That’s probably obvious, but tighten the strap, and it’ll cut into your chest at an odd angle or dig into your neck. Not even the load lifter on the very top of the strap helped, and this fit issue persisted whether the bag was completely full or empty. Of course, when full, it gets worse as the bag weighs down on your shoulder.

Aer Sling Bag 3 shoulder strap
Aer Sling Bag 3 | We couldn’t get comfortable with this shoulder strap.

The additional D-ring on the opposite side of the bag is so you can wear it either to the right or left. At first, we thought this was to attach a stabilizer strap, as we found ourselves wishing we had one. The sling tends to stick out at the bottom in an odd way without anything to anchor it down. Almost as if it’s a rocket pack with a mind of its own that wants to jet off away from you but can’t because it’s stuck to your back.

This doesn’t seem to be specific to height or torso size either. Several team members tried it on with similar issues, and we vary in height between 5’4”, 5’10”, and 6’2”. Even with the height differences, no one seemed to be able to adjust the strap so that it sat comfortably across their body. It’s a real shame because we’re huge fans of the internal organization.

Inside The Pack

Aer Sling Bag 3 front compartment
Aer Sling Bag 3 | The front pocket with a YKK Aquaguard zipper.

The front pocket opens up to a decent amount of space and a simple sleeve for quick-grab items. This is where your wallet or keys would go, and as we mentioned earlier, the YKK Aquaguard zipper keeps it airtight. This chunky boy can be sticky to open (and loud), but at least if someone tries to open it up and steal your stuff, you’ll hear it. If you’re going to utilize the shoe compartment, we recommend mainly putting flat items in here. This pocket worked well for a notebook, which is long and thin, so easy to pull out even if the bag is crammed.

We were really delighted to be able to fit a laptop inside the main compartment. The laptop sleeve in here can fit up to a 13” device and is lined with a thick felt that’s extra soft and cushiony. In front of that is a padded device sleeve that zips close. You could put a tablet here, but we mostly used it for our magic keyboard. Finally, there are two long, stretchy pockets in front of that which we used for cables and other tech gear. All of these pockets combined make for a great way to keep your electronics organized. It’s like a laptop sleeve with a built-in tech kit, and we like how they work together seamlessly.

Aer Sling Bag 3 tech sleeve
Aer Sling Bag 3 | Space for a laptop or tablet.

The rest of the main compartment is open space, and to be honest, what can fit inside comfortably depends primarily on whether you’ve packed shoes or not. A 20oz blender bottle and a change of clothes fit fine for us. Luckily it was all we needed to head over to the yoga studio after work. If you have more exercise gear to carry to the gym, you may find yourself needing more space.

Overall, the Aer Sling Bag 3 really shines when it comes to internal organization. The thoughtful layout and device sleeve that keeps all your tech organized in one place is excellent. Oh, how we wish the fit issues with the carry strap didn’t dull this sling bag’s shine.

Usage Timeline

Initial Usage

Condition: Excellent

  • The strap has a convenient quick-release buckle
  • Works as a gym bag because of its shoe compartment
  • Excellent tech organization inside
2 Weeks of Use

Condition: Excellent

  • Carry strap can cut into neck and chest and be uncomfortable
  • Convenient for biking between work and the gym
  • Main compartment is big enough to fit laptop, gym clothes and daily essentials
By Randiah Green
Created May 17, 2021 • Updated August 23, 2022
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