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We will get to compare Exos 48 vs 58.
But before we do that, in order for you to be able to compare and then choose between them correctly, you must first understand how Exos/Eja packs are positioned in Osprey's entire ocean of backpacks.
That said, if you'd like to hear a short answer from me, then here it is:
I'd recommend you to make your decision around trip length. Get the Exos 48 for backpacking trips of 3 days tops and the 58 for 5 days tops. There's no difference between them rather than the volume.
Now let's get to the bolts and nuts.
Is Exos really the line you're looking for?
I want you to read this because Exos appeals to a rather narrower percentage of audience.
- #A sidenote here: REI's backpack capacity chart is GOLD. Highly recommend you to check it out before you read any further.
The former is lighter (and hence, the lightest), whereas the latter is equipped with more organizational features and is more durable; at the expense of some weight (around 0.6 lbs (270 grams), depending on selected size). So, Exos/Eja is positioned closer to a typical backpack anatomy.
If this design intention doesn't really respond to your own needs and desires, or in other words, if you don't pack ultralight gear but typical stuff; then you should probably stop reading and forget about getting either of Exos/Eja 48 and 58.
- Bold are my top picks for each group (based on trip length).
- If you tend to pack more or less than the average person, then shift the trip length values accordingly.
- If you're planning to get either one of them, I'd also highly recommend you to check out Osprey's own PackFinder tool as well.
To see the full table and my top picks, visit my post Best Osprey Hiking Backpacks.
Rotate your phone sideways for a better table display.
Features & Organization
Weight (M Size)
Trip Length: 7+ nights [>90 L]
Xenith 105 (Men's)
Trip Length: 5-7 nights [75 - 90 L]
Xenith 88 (Men's)
Xena 85 (Women's)
Aether AG 85 (Men's)
Ariel AG 75 (Women's)
Trip Length: 2-5 nights [55 - 75 L]
Sweet spot. Versatile picks.
Atmos AG 65 (Men's)
Aura AG 65 (Women's)
Xenith 75 (Men's)
Xena 70 (Women's)
Volt 75 (Men's)
Viva 65 (Women's)
Aether PRO 70 (Men's)
Ariel PRO 65 (Women's)
Aether AG 70 (Men's)
Ariel AG 65 (Women's)
Aether AG 60 (Men's)
Ariel AG 55 (Women's)
Volt 60 (Men's)
Rook 65 (Men's)
Renn 65 (Women's)
Levity 60 (Men's)
Lumina 60 (Women's)
Exos 58 (Men's)
Eja 58 (Women's)
Trip Length: 1-3 nights [45 - 55 L]
Atmos AG 50 (Men's)
Aura AG 50 (Women's)
Kestrel 48 (Men's)
Kyte 46 (Women's)
Stratos 50 (Men's)
Sirrus 50 (Women's)
Levity 45 (Men's)
Lumina 45 (Women's)
Exos 48 (Men's)
Eja 48 (Women's)
Rook 50 (Men's)
Renn 50 (Women's)
Viva 50 (Women's)
Trip Length: 0-1 nights [<45 L]
Kestrel 38 (Men's)
Kyte 36 (Women's)
Stratos 36 (Men's)
Sirrus 36 (Women's)
Talon 44 (Men's)
Tempest 40 (Women's)
Talon 33 (Men's)
Tempest 30 (Women's)
Exos 38 (Men's)
Eja 38 (Women's)
If you're interested in getting a travel backpack, check out my Osprey's top travel backpacks post.
Because I'm 100% sure there's another Osprey Backpack out there that responds perfectly even to the narrowest type of audience. They niche down to so many purposes it might actually freak you out.
So if you aren't an ultralighter, I'd recommend you to check out my Osprey Exos vs Atmos post.
If you are an ultralighter, though; then keep reading.
Volume: Should you get the 48 or 58?
38 is too small for backpacking anyway - only day hiking.
Exos is rather a streamlined piece:
- Consists of main compartment only (no sleeping compartment),
- Offers top access only (no bottom or mid access),
- Only 3 exterior pockets,
- Lid can be removed to save some weight.
There's no difference between 48 and 58 rather than volume.
And most of that volume is carried out within the main compartments of each pack.
Which means that they aren't one of those packs trying to trick you into believing they're actually larger than they really are by putting their large pockets into play to exaggerate their technical specs section.
Load capability ranges of these packs are also the same: 20-40 lbs. If you try to push this further, you will notice better results with the 58 due to its larger frame, though.
Like I said earlier into the post, get the Exos 48 for backpacking trips of 3 days tops and the 58 for 5 days tops.
If you aren't an ultralighter, I wouldn't recommend you to get either of them and instead to check out my Osprey Exos vs Atmos post.