Osprey Eja 58 vs Osprey Tempest Pro 40
Quick take: The Osprey Tempest Pro 40 costs $5 less; the Osprey Eja 58 carries more (58 vs 40 liters); the Osprey Eja 58 is lighter (2.82 vs 2.9 lbs).
Which one to buy
A bigger pack that weighs less, for $5 more: on paper the Eja 58 beats the Tempest Pro 40 on nearly everything that matters for an overnight. It weighs 2.82 lbs to the Tempest Pro's 2.9 lbs, carries 18 L more, is rated to 35 lbs against 30, and puts the load on AirSpeed suspended mesh where the Tempest Pro uses a foam contact panel. Both are women's fits with torso adjustment, the Eja through five set points across 4 in in each of two sizes, the Tempest Pro through a sliding yoke.
The Eja has caveats. Testers measured its main compartment at 45 L, so it packs well under its 58 L badge, and the 35 lb ceiling is real: the light frame flexes noticeably above it. The 100D ripstop holds up better than its denier suggests but is still thin against rock, and the mesh panel is awkward to repair in the field.
The Tempest Pro 40 is sold as a fast-and-light day and overnight pack, and its strengths are the BioStretch harness and hipbelt that move with your body, a floating lid with an under-lid key clip, and removable sleeping-pad straps. It makes sense if you want one pack for big-mileage days that can stretch to a compact overnight. For anyone whose main use is backpacking, the Eja is the better buy.
Osprey Eja 58
A good match for women backpacking or thru-hiking with loads under 35 lbs who want a ventilated back and room for a multi-day kit.
Osprey Tempest Pro 40
Makes sense if most of your outings are long day hikes and only some are compact overnights, and you prefer a harness that flexes with you.
| Spec | Osprey Eja 58 | Osprey Tempest Pro 40 |
|---|---|---|
| Price | $285 | $280 |
| Rating | 4.4★ (74) | — |
| Type | Ultralight Pack | Daypack |
| Frame Type | Internal Frame | Internal Frame |
| Capacity | 58 L | 40 L |
| Weight | 2.82 lbs | 2.9 lbs |
| Max Load | 35 lbs | 15-30 lbs |
| Torso Fit | XS/S and M/L, five set points across 4 in | Adjustable via sliding yoke; see manufacturer sizing |
| Material | 100D high-tenacity recycled ripstop nylon | bluesign-approved recycled high-tenacity nylon, PFC-free DWR |
| Back Panel | AirSpeed suspended mesh over LightWire perimeter frame | AirScape injection-molded framesheet with die-cut foam over a LightWire peripheral frame |
| Adjustable torso | Yes | Yes |
| Ventilated back | Yes | No |
| Raincover included | No | No |
| Hipbelt pockets | Yes | Yes |
| Removable lid | Yes | No |
| Hydration sleeve | Yes | Yes |
| Fits BV500 bear can | Yes | No |
| Warranty | Osprey All Mighty Guarantee (lifetime) | Osprey All Mighty Guarantee (lifetime) |
Pros & cons
Osprey Eja 58
- ✓2.8 lb for a framed, ventilated 58 L pack is genuinely light and undercuts most mainstream competitors.
- ✓The AirSpeed suspended mesh is unusual at this weight; most packs this light use a foam contact panel.
- ✓Five torso set points across four inches give real adjustment rather than a single fixed length.
- ✓Three volumes (38, 48, 58 L) is the deepest size run in Osprey's women's ultralight line.
- ✓100D high-tenacity recycled ripstop is a modern fabric that holds up better than its denier suggests.
- ✓Hipbelt pockets are included, which several ultralight competitors omit.
- ✓Osprey's All Mighty Guarantee is far stronger than the warranties most ultralight brands offer.
- ✗OutdoorGearLab measured 45 L in the main compartment against 58 L advertised.
- ✗The 35 lb ceiling is real; the light frame flexes noticeably above it.
- ✗100D ripstop is thin and vulnerable to abrasion against rock.
- ✗The suspended mesh consumes depth, so the pack is narrower inside than its volume implies.
- ✗$285 is expensive next to cottage ultralight packs of similar weight.
- ✗No rain cover included at this price.
- ✗The mesh panel is a wear point that is awkward to repair in the field.
Osprey Tempest Pro 40
- ✓Sliding-yoke torso adjustment on a pack under 3 lbs
- ✓Peripheral frame rated to 30 lbs makes a light overnight realistic
- ✓Floating top lid with zip pocket plus an under-lid key-clip pocket
- ✓Zippered hipbelt pockets and a reservoir sleeve
- ✓Gender-specific harness and hipbelt sizing, which Osprey builds into the whole Talon Pro and Tempest Pro series
- ✓Removable sleeping-pad straps
- ✗$280 for 40 L is more than the 48 L Kyte at $240
- ✗No raincover listed
- ✗Foam contact back panel, not suspended mesh
- ✗Osprey's spec sheet gives no torso range in inches
Osprey Eja 58 vs Osprey Tempest Pro 40: common questions
Why would anyone pick the Tempest Pro 40 when the Eja 58 is lighter and bigger?▾
Mainly for its day-hike focus: the BioStretch harness and hipbelt move with your body, and the 40 L size is less pack to manage on fast days. For multi-night trips, the Eja 58's extra volume, higher rating and suspended mesh win.
Is the Eja 58 really 58 liters compared with the Tempest Pro 40?▾
Testers measured the Eja 58's main compartment at 45 L, with the rest in pockets and the extension collar. That still leaves it ahead of the Tempest Pro 40, but plan your kit around the smaller number.
Which one keeps your back cooler on a hot climb?▾
The Eja 58. Its AirSpeed suspended mesh holds the pack off your back, while the Tempest Pro 40 uses an injection-molded framesheet with die-cut foam that sits against you.