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:
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.
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.
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.