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Aion 40L Backpack

4.588235294117647 out of 5 stars
17 Reviews



Why We Like The Aion 40L Backpack

Whether you are jumping on a plane or heading from the gym to the office, the Aion 40L backpack gets you and your gear wherever you are going with ease. This bag is compliant with carry-on requirements for most airlines, features padded storage for your laptop or tablet, and small internal pockets for your smaller items, making travel a breeze. On the top of the bag is a removable TPU rolltop bag, allowing you to store your used gym clothes without moisture or odor traveling to the remainder of the bag.


  • TPU rolltop bag keeps dirty items separate from the rest of the bag
  • Internal and external zippered pockets keep your items secure and safe
  • External zippers easily lock together for extra security
  • Outer fabric lined with a water-resistant coating to repel moisture
  • Water bottle pocket on side of the bag to easily store your bottle within reach
  • Item #THUZ3IJ
Responsible Collection
Bluesign Approved, Recycled/Repurposed
waxed p600 polyester canvas, DWR coating, 100% recycled polyester
40L (2441cu in)
shoulder straps
Shoulder Straps
2 padded
Waist Belt
sold seperately
Hydration Compatible
yes, side water bottle pocket
[external] zippered top pocket, water bottle pocket [internal] zippered pocket
internal compression strap
Claimed Weight
Manufacturer Warranty
limited lifetime

Overall Rating

4.5 based on 17 ratings

Review Summary

1 Stars - 1 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 3 reviews
5 Stars - 13 reviews

Fits Slightly Small

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


Selecting an option will reload the available reviews on the page
5 out of 5 stars

April 20, 2024

Practical, comfortable for air travel.

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

I intended to use this as a second carry-on bag for international flight, but didn't have to put it under my seat so can't comment about that. As far as packing it through the airports, it was easy to put on and take off (I'm 76 with bad shoulders), rests comfortably on my back and not a strain to carry through the airport. Has lots of room plus very accessible side pocket for may laptop and some magazines and another smaller outside pocket for small items. Very pleased with this pack, and received compliments from others in our group.


Originally reviewed on Backcountry.com

5 out of 5 stars

October 29, 2023

Got this last week!!! Just great 👍 Has every thing you need for travel

Wull 911

Originally reviewed on manufacturer

5 out of 5 stars

September 23, 2023

Great Bag

I love the color. Can tell it is made from quality materials.


Originally reviewed on manufacturer

5 out of 5 stars

August 6, 2023

Great features and Minimalist look

I love this bag! It's roomy, comfortable and looks classy.


Originally reviewed on manufacturer

5 out of 5 stars

June 12, 2023

Plenty of space for clothes and my important items

Just purchased a Thule Aion and used it for my recent short trip. As I live in Hawai’i and enjoy traveling to the mainland and foreign countries such as Japan, Italy, etc. I wanted a big enough backpack that can accommodate jackets, etc. for colder weather so I can wear them as soon as I arrive at my destinations. This backpack has multiple slots and pockets for my iPad, iPhone, chargers, keys, passport, pen, etc. I can easily get them out. I have four other backpacks, but this one is so far the best one for my short and long trips. Would highly recommend it for avid travelers.


Originally reviewed on manufacturer

5 out of 5 stars

March 5, 2023

Love it!

I bought this backpack, the Thule’s Aion 40L a few weeks ago and test drove it. Here’s what I found. This backpack meets both the carry-on requirements of both domestic and international overhead bin measurements . It fits nicely on the overhead compartments of Aer Lingus and Delta Airlines on my recent trip to Scotland. It packs nicely with ample room for my clothes for 9 days. You can hold a lot of stuff in this backpack and it’s very comfortable to carry as a backpack. I got the Nutria color and love the waxy look!


Originally reviewed on manufacturer

5 out of 5 stars

February 26, 2023

Great Travel Pack!

I purchased the black/charcoal version. This is a great carry on pack that is versatile and not to much to manage once you reach your destination. The bag has room and depending on how bulky your items are can carry quite a bit but be cautious not to overpack as it will not fit without extreme force in smaller planes overhead. The ONLY thing I would cautious buyers is the look of the bag after use and when you receive it. The texture THULE mentions of having a weathered look if factual and when you use it will get more "weathered". The look is not bad just looks like you have used the bag for multiple trips after your first one. If you expect the bag to have a "fresh" look all the time this is not the bag for you. Durability is excellent, definitely recommend it.

Robbie Rye

Originally reviewed on manufacturer

4 out of 5 stars

November 6, 2022

Almost Perfect; Needs A Few Tweaks In Round 2

Some things I would like to see in the next update… 1. Load lifter straps above each shoulder strap to redistribute the weight closer to the body. 2. Side compression straps to compress the pack when not fully loaded, and to reduce the outer dimensions when you’re trying to fit the bag in an overhead compartment or other tight space. When this thing is fully loaded, it has a tendency to look like a turtle shell on your back; compression straps would help with this. 3. Slightly more interior volume. 42-45L would be perfect for one-bag travel 4. Include the hip belt pack instead of forcing people to purchase it separately. It’s an ingenious idea, but it should already be included. A travel pack this size NEEDS a hip belt in order to redistribute weight off the back and shoulders and on to the hips.


Originally reviewed on manufacturer

5 out of 5 stars

August 29, 2022

Amazing bag

I purchased this bag since I travel by plane once a month for a small amount of time and I wanted a nice carry on. This is such an amazing travel backpack. It has compartments for everything. I like how it’s versatile, I can wear it as a duffel bag, or backpack! It’s the perfect bag for a small weekend trip, or for a weekend plane trip! I love it.

vegan girl

Originally reviewed on manufacturer

5 out of 5 stars

July 25, 2022

perfect backpack

Hi!! Thule!! It's a perfect backpack. I use this backpack every day. Thank you so much for making a good bag! But when I travel for 2 nights and 3 days in winter, the capacity is not enough. I want to put on a small bag. Like a picture. please Make it. please feed back.


Originally reviewed on manufacturer